Patent Publication Number: US-2023135454-A1

Title: Magnetic tape cartridge, magnetic tape drive, detection method of servo pattern, and program

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from Japanese Patent Application No. 2021-178342, filed Oct. 29, 2021, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     Technical Field 
     The technology of the present disclosure relates to a magnetic tape cartridge, a magnetic tape drive, a detection method of a servo pattern, and a non-transitory storage medium storing a program. 
     Related Art 
     In U.S. Pat. No. 7,365,929B, it is disclosed to provide a fully synchronous servo channel for a data tape drive, which includes initial acquisition of synchronous servo channel parameters, generation of a timing basis for signal interpolation, generation of a tape velocity estimation value and a y-position estimation value, and optimum detection of longitudinal position (LPOS) symbols. 
     U.S. Pat. No. 9,754,616B discloses a device including at least two modules each having an array of converters, in which the at least two modules are fixed to each other, an axis of each array is defined between both ends thereof, the axes of the arrays are oriented approximately parallel to each other, and the array of a first module among the modules is offset from the array of a second module in a first direction parallel to the axis of the array of the second module, and a converter of the first module is approximately aligned with a converter of the second module in an intended tape movement direction in a case in which the axes are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to the intended tape movement direction, and a mechanism for orienting the modules to control a converter pitch presented with respect to the tape. 
     SUMMARY 
     One embodiment according to the technology of the present disclosure provides a magnetic tape cartridge, a magnetic tape drive, a detection method of a servo pattern, and a non-transitory storage medium storing a program capable of obtaining a servo pattern signal having high reliability. 
     A first aspect according to the technology of the present disclosure relates to a magnetic tape cartridge comprising a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction, and a storage medium, in which the storage medium stores servo format information including servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line. 
     A second aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the first aspect, in which the first imaginary straight line is a straight line along a width direction of the magnetic tape, the servo pattern is at least one linear magnetization region pair, the linear magnetization region pair includes a first linear magnetization region which is linearly magnetized, and a second linear magnetization region which is linearly magnetized, the first linear magnetization region and the second linear magnetization region are inclined in opposite directions with respect to the first imaginary straight line, the first linear magnetization region has a steeper inclined angle with respect to the first imaginary straight line than the second linear magnetization region, and the servo pattern inclination information includes information on the inclined angle of the first linear magnetization region with respect to the first imaginary straight line, and information on an inclined angle of the second linear magnetization region with respect to the first imaginary straight line. 
     A third aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the second aspect, in which positions of both ends of the first linear magnetization region and positions of both ends of the second linear magnetization region are aligned in the width direction of the magnetic tape. 
     A fourth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the third aspect, in which a total length of the first linear magnetization region is shorter than a total length of the second linear magnetization region. 
     A fifth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the second to fourth aspects, in which the first linear magnetization region is a set of a plurality of first magnetization straight lines, and the second linear magnetization region is a set of a plurality of second magnetization straight lines. 
     A sixth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the second to fifth aspects, in which a geometrical characteristic of the linear magnetization region pair on the magnetic tape corresponds to a geometrical characteristic based on a pair of imaginary linear regions inclined line-symmetrically with respect to the first imaginary straight line in a case in which an entirety of the pair of imaginary linear regions is inclined with respect to the first imaginary straight line by inclining a symmetry axis of the pair of imaginary linear regions with respect to the first imaginary straight line. 
     A seventh aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the third, fourth, and fifth aspects citing the third or fourth aspect, in which a geometrical characteristic of the linear magnetization region pair on the magnetic tape corresponds to a geometrical characteristic in which positions of both ends of one imaginary linear region of a pair of imaginary linear regions inclined line-symmetrically with respect to the first imaginary straight line and positions of both ends of the other imaginary linear region are aligned in the width direction in a case in which an entirety of the pair of imaginary linear regions is inclined with respect to the first imaginary straight line by inclining a symmetry axis of the pair of imaginary linear regions with respect to the first imaginary straight line. 
     An eighth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the first to seventh aspects, in which the servo format information includes an ideal waveform signal indicating an ideal waveform of a servo pattern signal which is a result of reading the servo pattern by a servo reading element. 
     A ninth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the eighth aspect, in which the ideal waveform is a waveform determined in accordance with an orientation of the servo reading element on the magnetic tape. 
     A tenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the ninth aspect, in which the ideal waveform is a waveform determined in accordance with a geometrical characteristic of the servo pattern and the orientation of the servo reading element on the magnetic tape. 
     An eleventh aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the eighth aspect, in which the servo reading element is mounted on a magnetic head, and the ideal waveform is a waveform determined in accordance with an orientation of the magnetic head on the magnetic tape. 
     A twelfth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the eleventh aspect, in which the ideal waveform is a waveform determined in accordance with a geometrical characteristic of the servo pattern and the orientation of the magnetic head on the magnetic tape. 
     A thirteenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the first to twelfth aspects, in which the servo format information includes information on a width of the magnetic tape and/or information on a geometrical characteristic of the servo pattern. 
     A fourteenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the first to thirteenth aspects, in which the servo format information includes width adjustment information for adjusting a width of the magnetic tape. 
     A fifteenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the fourteenth aspect, in which the width adjustment information includes information on tension of the magnetic tape in total length direction. 
     A sixteenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the fifteenth aspect, in which the information on the tension is determined in accordance with the width of the magnetic tape, a characteristic of the magnetic tape itself, a use history of the magnetic tape, a temperature given to the magnetic tape, and/or humidity given to the magnetic tape. 
     A seventeenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the first to sixteenth aspects, in which the servo format information includes information on a skew angle which is an angle at which a magnetic head on which a servo reading element that reads the servo pattern is mounted is skewed on the magnetic tape. 
     An eighteenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to the seventeenth aspect, in which the information on the skew angle is determined in accordance with a width of the magnetic tape, a characteristic of the magnetic tape itself, a use history of the magnetic tape, a temperature given to the magnetic tape, and/or humidity given to the magnetic tape. 
     A nineteenth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the first to eighteenth aspects, in which the magnetic tape is accommodated in a cartridge, and a noncontact storage medium is provided in the cartridge as the storage medium. 
     A twentieth aspect according to the technology of the present disclosure relates to the magnetic tape cartridge according to any one of the first to eighteenth aspects, in which the storage medium is the magnetic tape. 
     A twenty-first aspect according to the technology of the present disclosure relates to a magnetic tape drive comprising a processor, in which the processor acquires the servo format information stored in the storage medium provided in the magnetic tape cartridge according to any one of the first to twentieth aspects, and executes processing in accordance with the acquired servo format information. 
     A twenty-second aspect according to the technology of the present disclosure relates to a detection method of a servo pattern, the method comprising acquiring servo format information that is stored in a storage medium provided in a magnetic tape cartridge including a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction, and includes servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line, and executing processing in accordance with the acquired servo format information. 
     A twenty-third aspect according to the technology of the present disclosure relates to a non-transitory storage medium storing a program causing a computer to execute a process comprising acquiring servo format information that is stored in a storage medium provided in a magnetic tape cartridge including a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction, and includes servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line, and executing processing in accordance with the acquired servo format information. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a block diagram showing an example of a configuration of a magnetic tape system according to an embodiment. 
         FIG.  2    is a schematic perspective view of an example of an appearance of a magnetic tape cartridge according to the embodiment. 
         FIG.  3    is a schematic configuration diagram showing an example of a hardware configuration of a magnetic tape drive according to the embodiment. 
         FIG.  4    is a schematic perspective view showing an example of an aspect in which a magnetic field is released by a noncontact read/write device from a lower side of the magnetic tape cartridge according to the embodiment. 
         FIG.  5    is a schematic configuration diagram showing an example of the hardware configuration of the magnetic tape drive according to the embodiment. 
         FIG.  6    is a conceptual diagram showing an example of an aspect in which a state in which a magnetic head is disposed on a known magnetic tape in the related art is observed from a front surface side of the magnetic tape. 
         FIG.  7    is a conceptual diagram showing an example of an aspect in which the known magnetic tape in the related art before and after a width of the magnetic tape contracts is observed from the front surface side of the magnetic tape. 
         FIG.  8    is a conceptual diagram showing an example of an aspect in which a state in which the magnetic head is skewed on the known magnetic tape in the related art is observed from the front surface side of the magnetic tape. 
         FIG.  9    is a conceptual diagram showing an example of an aspect in which the magnetic tape according to the embodiment is observed from the front surface side of the magnetic tape. 
         FIG.  10    is a conceptual diagram showing an example of a relationship between a geometrical characteristic of an actual servo pattern and a geometrical characteristic of an imaginary servo pattern. 
         FIG.  11    is a conceptual diagram showing an example of an inclined angle of the actual servo pattern. 
         FIG.  12    is a conceptual diagram showing an example of an aspect in which a state in which the servo pattern is read by a servo reading element provided in the magnetic head that is not skewed on the magnetic tape according to the embodiment is observed from the front surface side of the magnetic tape. 
         FIG.  13    is a conceptual diagram showing an example of an aspect in which a state in which the servo pattern is read by the servo reading element provided in the magnetic head that is skewed on the magnetic tape according to the embodiment is observed from the front surface side of the magnetic tape. 
         FIG.  14    is a conceptual diagram showing an example of a function of a control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  15    is a conceptual diagram showing an example of an aspect in which a state in which the servo pattern is read by the servo reading element provided in the magnetic head that is skewed on the magnetic tape according to the embodiment is observed from the front surface side of the magnetic tape. 
         FIG.  16    is a conceptual diagram showing an example of the function of the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  17    is a conceptual diagram showing an example of functions of a controller and a position detection unit provided in the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  18    is a conceptual diagram showing an example of a configuration of a servo writer according to the embodiment. 
         FIG.  19    is a flowchart showing an example of a flow of servo pattern detection processing according to the embodiment. 
         FIG.  20    is a conceptual diagram showing a first modification example, and is a conceptual diagram showing an example of functions of the controller and a PES calculation unit provided in the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  21    is a conceptual diagram showing a second modification example, and is a conceptual diagram showing an example of an aspect in which servo format information is stored in a cartridge memory. 
         FIG.  22    is a conceptual diagram showing a third modification example, and is a conceptual diagram showing an example of the function of the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  23    is a conceptual diagram showing the third modification example, and is a conceptual diagram showing an example of the aspect in which the servo format information is stored in the cartridge memory. 
         FIG.  24    is a conceptual diagram showing the third modification example, and is a conceptual diagram showing an example of the aspect in which the servo format information is stored in the cartridge memory. 
         FIG.  25    is a conceptual diagram showing a fourth modification example, and is a conceptual diagram showing an example of the function of the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  26    is a conceptual diagram showing the fourth modification example, and is a conceptual diagram showing an example of the aspect in which the servo format information is stored in the cartridge memory. 
         FIG.  27    is a conceptual diagram showing a fifth modification example, and is a conceptual diagram showing an example of functions of the controller and an angle detection unit provided in the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  28    is a conceptual diagram showing the fifth modification example, and is a conceptual diagram showing an example of the function of the angle detection unit provided in the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  29    is a conceptual diagram showing a fifth modification example, and is a conceptual diagram showing an example of the functions of the controller and the PES calculation unit provided in the control device provided in the magnetic tape drive according to the embodiment. 
         FIG.  30    is a conceptual diagram showing a sixth modification example, and is a conceptual diagram showing a modification example of the magnetic tape according to the embodiment (conceptual diagram showing an example of an aspect in which the magnetic tape is observed from the front surface side of the magnetic tape). 
         FIG.  31    is a conceptual diagram showing the sixth modification example, and is a conceptual diagram showing an example of an aspect of the servo pattern included in the magnetic tape. 
         FIG.  32    is a conceptual diagram showing a seventh modification example, and is a conceptual diagram showing a modification example of the magnetic tape according to the embodiment (conceptual diagram showing an example of an aspect in which the magnetic tape is observed from the front surface side of the magnetic tape). 
         FIG.  33    is a conceptual diagram showing the seventh modification example, and is a conceptual diagram showing an example of an aspect of the servo pattern included in the magnetic tape. 
         FIG.  34    is a conceptual diagram showing an eighth modification example, and is a conceptual diagram showing a modification example of the magnetic tape according to the embodiment (conceptual diagram showing an example of an aspect in which the magnetic tape is observed from the front surface side of the magnetic tape). 
         FIG.  35    is a conceptual diagram showing the eighth modification example, and is a conceptual diagram showing a relationship between the geometrical characteristic of the actual servo pattern and the geometrical characteristic of the imaginary servo pattern. 
         FIG.  36    is a conceptual diagram showing the eighth modification example, and is a conceptual diagram showing an example of an aspect in which a state in which the servo pattern is read by the servo reading element provided in the magnetic head that is skewed on the magnetic tape according to the embodiment is observed from the front surface side of the magnetic tape. 
         FIG.  37    is a conceptual diagram showing a ninth modification example, and is a conceptual diagram showing a modification example of the magnetic tape according to the embodiment (conceptual diagram showing an example of an aspect in which the magnetic tape is observed from the front surface side of the magnetic tape). 
         FIG.  38    is a conceptual diagram showing the ninth modification example, and is a conceptual diagram showing an example of an aspect of the servo pattern included in the magnetic tape. 
         FIG.  39    is a conceptual diagram showing a tenth modification example, and is a conceptual diagram showing a modification example of the magnetic tape according to the embodiment (conceptual diagram showing an example of an aspect in which the magnetic tape is observed from the front surface side of the magnetic tape). 
         FIG.  40    is a conceptual diagram showing the tenth modification example, and is a conceptual diagram showing an example of an aspect of the servo pattern included in the magnetic tape. 
         FIG.  41    is a conceptual diagram showing an eleventh modification example, and is a conceptual diagram showing an example of an aspect in which the servo format information is stored in the magnetic tape. 
         FIG.  42    is a conceptual diagram showing a twelfth modification example, and is a conceptual diagram showing an example of an aspect of the servo pattern included in the magnetic tape. 
         FIG.  43    is a conceptual diagram showing an example of an aspect in which a servo pattern detection program stored in a storage medium is installed in a computer of the control device. 
     
    
    
     DETAILED DESCRIPTION 
     In the following, an example of an embodiment of a magnetic tape cartridge, a magnetic tape drive, and a detection method of a servo pattern according to the technology of the present disclosure will be described with reference to the accompanying drawings. 
     First, the terms used in the following description will be described. 
     NVM refers to an abbreviation of “non-volatile memory”. CPU refers to an abbreviation of “central processing unit”. RAM refers to an abbreviation of “random access memory”. EEPROM refers to an abbreviation of “electrically erasable and programmable read only memory”. SSD refers to an abbreviation of “solid state drive”. HDD refers to an abbreviation of “hard disk drive”. ASIC refers to an abbreviation of “application specific integrated circuit”. FPGA refers to an abbreviation of “field-programmable gate array”. PLC is an abbreviation of “programmable logic controller”. IC refers to an abbreviation of “integrated circuit”. RFID refers to an abbreviation of “radio frequency identifier”. BOT refers to an abbreviation of “beginning of tape”. EOT refers to an abbreviation of “end of tape”. UI refers to an abbreviation of “user interface”. WAN refers to an abbreviation of “wide area network”. LAN refers to an abbreviation of “local area network”. PES refers to an abbreviation of “position error signal”. 
     As an example, as shown in  FIG.  1   , a magnetic tape system  10  comprises a magnetic tape cartridge  12  and a magnetic tape drive  14 . A magnetic tape cartridge  12  is loaded into the magnetic tape drive  14 . The magnetic tape cartridge  12  accommodates a magnetic tape MT. The magnetic tape drive  14  pulls out the magnetic tape MT from the loaded magnetic tape cartridge  12 , and records data in the magnetic tape MT and reads data from the magnetic tape MT while causing the pulled out magnetic tape MT to travel. 
     In the present embodiment, the magnetic tape drive  14  is an example of a “magnetic tape drive” according to the technology of the present disclosure. In addition, the magnetic tape cartridge  12  is an example of a “magnetic tape cartridge” according to the technology of the present disclosure. In addition, the magnetic tape MT is an example of a “magnetic tape” according to the technology of the present disclosure. 
     Next, an example of a configuration of the magnetic tape cartridge  12  will be described with reference to  FIGS.  2  to  4   . It should be noted that, in the following description, for convenience of description, in  FIGS.  2  to  4   , a loading direction of the magnetic tape cartridge  12  into the magnetic tape drive  14  is indicated by an arrow A, a direction of the arrow A is defined as a front direction of the magnetic tape cartridge  12 , and a side of the magnetic tape cartridge  12  in the front direction is defined as a front side of the magnetic tape cartridge  12 . In the following description of the structure, “front” refers to the front side of the magnetic tape cartridge  12 . 
     In addition, in the following description, for convenience of description, in  FIGS.  2  to  4   , a direction of an arrow B orthogonal to the direction of the arrow A is defined as a right direction, and a side of the magnetic tape cartridge  12  in the right direction is defined as a right side of the magnetic tape cartridge  12 . In the following description of the structure, “right” refers to the right side of the magnetic tape cartridge  12 . 
     In addition, in the following description, for convenience of description, in  FIGS.  2  to  4   , a direction opposite to the direction of the arrow B is defined as a left direction, and a side of the magnetic tape cartridge  12  in the left direction is defined as a left side of the magnetic tape cartridge  12 . In the following description of the structure, “left” refers to the left side of the magnetic tape cartridge  12 . 
     In addition, in the following description, for convenience of description, in  FIGS.  2  to  4   , a direction orthogonal to the direction of the arrow A and the direction of the arrow B is indicated by an arrow C, a direction of the arrow C is defined as an upper direction of the magnetic tape cartridge  12 , and a side of the magnetic tape cartridge  12  in the upper direction is defined as an upper side of the magnetic tape cartridge  12 . In the following description of the structure, “upper” refers to the upper side of the magnetic tape cartridge  12 . 
     In addition, in the following description, for convenience of description, in  FIGS.  2  to  4   , a direction opposite to the front direction of the magnetic tape cartridge  12  is defined as a rear direction of the magnetic tape cartridge  12 , and a side of the magnetic tape cartridge  12  in the rear direction is defined as a rear side of the magnetic tape cartridge  12 . In the following description of the structure, “rear” refers to the rear side of the magnetic tape cartridge  12 . 
     In addition, in the following description, for convenience of description, in  FIGS.  2  to  4   , a direction opposite to the upper direction of the magnetic tape cartridge  12  is defined as a lower direction of the magnetic tape cartridge  12 , and a side of the magnetic tape cartridge  12  in the lower direction is defined as a lower side of the magnetic tape cartridge  12 . In the following description of the structure, “lower” refers to the lower side of the magnetic tape cartridge  12 . 
     As an example, as shown in  FIG.  2   , the magnetic tape cartridge  12  has a substantially rectangular shape in a plan view, and comprises a box-shaped case  16 . The magnetic tape MT is accommodated in the case  16 . The case  16  is made of resin, such as polycarbonate, and comprises an upper case  18  and a lower case  20 . The upper case  18  and the lower case  20  are bonded by welding (for example, ultrasound welding) and screwing in a state in which a lower peripheral edge surface of the upper case  18  and an upper peripheral edge surface of the lower case  20  are brought into contact with each other. The bonding method is not limited to welding and screwing, and other bonding methods may be used. The case  16  is an example of a “cartridge” according to the technology of the present disclosure. 
     A sending reel  22  is rotatably accommodated inside the case  16 . The sending reel  22  comprises a reel hub  22 A, an upper flange  22 B 1 , and a lower flange  22 B 2 . The reel hub  22 A is formed in a cylindrical shape. The reel hub  22 A is an axial center portion of the sending reel  22 , has an axial center direction along an up-down direction of the case  16 , and is disposed in a center portion of the case  16 . Each of the upper flange  22 B 1  and the lower flange  22 B 2  is formed in an annular shape. A center portion of the upper flange  22 B 1  in a plan view is fixed to an upper end portion of the reel hub  22 A, and a center portion of the lower flange  22 B 2  in a plan view is fixed to a lower end portion of the reel hub  22 A. It should be noted that the reel hub  22 A and the lower flange  22 B 2  may be integrally molded. 
     The magnetic tape MT is wound around an outer peripheral surface of the reel hub  22 A, and an end portion of the magnetic tape MT in a width direction is held by the upper flange  22 B 1  and the lower flange  22 B 2 . 
     An opening  16 B is formed on a front side of a right wall  16 A of the case  16 . The magnetic tape MT is pulled out from the opening  16 B. 
     A cartridge memory  24  is provided in the lower case  20 . Specifically, the cartridge memory  24  is accommodated in a right rear end portion of the lower case  20 . An IC chip including an NVM is mounted on the cartridge memory  24 . In the present embodiment, a so-called passive RFID tag is adopted as the cartridge memory  24 , and the read/write of various pieces of information is performed with respect to the cartridge memory  24  in a noncontact manner. The cartridge memory  24  is an example of a “noncontact storage medium” and a “storage medium” according to the technology of the present disclosure. 
     The cartridge memory  24  stores management information for managing the magnetic tape cartridge  12 . Examples of the management information include information on the cartridge memory  24  (for example, information for specifying the magnetic tape cartridge  12 ), information on the magnetic tape MT (for example, information indicating a recording capacity of the magnetic tape MT, information indicating an outline of the data recorded in the magnetic tape MT, information indicating items of the data recorded in the magnetic tape MT, and information indicating a recording format of the data recorded in the magnetic tape MT), and information on the magnetic tape drive  14  (for example, information indicating a specification of the magnetic tape drive  14  and a signal used in the magnetic tape drive  14 ). In addition, as will be described in detail below, servo format information (see  FIG.  14   ) is stored in the cartridge memory  24 . 
     As an example, as shown in  FIG.  3   , the magnetic tape drive  14  comprises a transport device  26 , a magnetic head  28 , a control device  30 , a storage  32 , a UI system device  34 , and a communication interface  35 . The magnetic tape drive  14  is loaded into the magnetic tape cartridge  12  along the direction of the arrow A. In the magnetic tape drive  14 , the magnetic tape MT is pulled out from the magnetic tape cartridge  12  and used. The magnetic head  28  is an example of a “magnetic head” according to the technology of the present disclosure. 
     The magnetic tape MT has a magnetic layer  29 A, a base film  29 B, and a back coating layer  29 C. The magnetic layer  29 A is formed on one surface side of the base film  29 B, and the back coating layer  29 C is formed on the other surface side of the base film  29 B. The data is recorded in the magnetic layer  29 A. The magnetic layer  29 A contains ferromagnetic powder. As the ferromagnetic powder, for example, ferromagnetic powder generally used in the magnetic layer of various magnetic recording media is used. Preferable specific examples of the ferromagnetic powder include hexagonal ferrite powder. Examples of the hexagonal ferrite powder include hexagonal strontium ferrite powder and hexagonal barium ferrite powder. The back coating layer  29 C is a layer containing non-magnetic powder, such as carbon black. The base film  29 B is also referred to as a support, and is made of, for example, polyethylene terephthalate, polyethylene naphthalate, or polyamide. It should be noted that a non-magnetic layer may be formed between the base film  29 B and the magnetic layer  29 A. In the magnetic tape MT, a surface on which the magnetic layer  29 A is formed is a front surface  31  of the magnetic tape MT, and a surface on which the back coating layer  29 C is formed is a back surface  33  of the magnetic tape MT. 
     The magnetic tape drive  14  performs magnetic processing on the front surface  31  of the magnetic tape MT by using the magnetic head  28 . Here, the magnetic processing refers to recording the data in the front surface  31  of the magnetic tape MT and reading the data (that is, reproducing the data) from the front surface  31  of the magnetic tape MT. In the present embodiment, the magnetic tape drive  14  selectively records the data in the front surface  31  of the magnetic tape MT and reads the data from the front surface  31  of the magnetic tape MT by using the magnetic head  28 . That is, the magnetic tape drive  14  pulls out the magnetic tape MT from the magnetic tape cartridge  12 , records the data in the front surface  31  of the pulled out magnetic tape MT by using the magnetic head  28 , or reads the data from the front surface  31  of the pulled out magnetic tape MT by using the magnetic head  28 . 
     The control device  30  controls the entire magnetic tape drive  14 . In the present embodiment, although the control device  30  is realized by an ASIC, the technology of the present disclosure is not limited to this. For example, the control device  30  may be realized by an FPGA and/or a PLC. In addition, the control device  30  may be realized by the computer including a CPU, a flash memory (for example, an EEPROM and/or an SSD), and a RAM. In addition, the control device  30  may be realized by combining two or more of an ASIC, an FPGA, a PLC, and a computer. That is, the control device  30  may be realized by a combination of a hardware configuration and a software configuration. It should be noted that the control device  30  is an example of a “processor” according to the technology of the present disclosure. 
     The storage  32  is connected to the control device  30 , and the control device  30  writes various pieces of information to the storage  32  and reads out various pieces of information from the storage  32 . Examples of the storage  32  include a flash memory and/or an HDD. The flash memory and the HDD are merely examples, and any memory may be used as long as the memory is a non-volatile memory that can be mounted on the magnetic tape drive  14 . 
     The UI system device  34  is a device having the reception function of receiving a command signal indicating a command from a user and the presentation function of presenting the information to the user. The reception function is realized by a touch panel, a hard key (for example, a keyboard), and/or a mouse, for example. The presentation function is realized by a display, a printer, and/or a speaker, for example. The UI system device  34  is connected to the control device  30 . The control device  30  acquires the command signal received by the UI system device  34 . The UI system device  34  presents various pieces of information to the user under the control of the control device  30 . 
     The communication interface  35  is connected to the control device  30 . In addition, the communication interface  35  is connected to an external device  37  via a communication network (not shown), such as a WAN and/or a LAN. The communication interface  35  controls the exchange of various pieces of information (for example, the data to be recorded in the magnetic tape MT, the data read from the magnetic tape MT, and/or a command signal given to the control device  30 ) between the control device  30  and the external device  37 . It should be noted that examples of the external device  37  include a personal computer and a mainframe. 
     The transport device  26  is a device that selectively transports the magnetic tape MT along a predetermined path in a forward direction and a backward direction, and comprises a sending motor  36 , a winding reel  38 , a winding motor  40 , and a plurality of guide rollers GR. It should be noted that, here, the forward direction refers to a sending direction of the magnetic tape MT, and the backward direction refers to a rewinding direction of the magnetic tape MT. 
     The sending motor  36  rotates the sending reel  22  in the magnetic tape cartridge  12  under the control of the control device  30 . The control device  30  controls the sending motor  36  to control a rotation direction, a rotation speed, a rotation torque, and the like of the sending reel  22 . 
     The winding motor  40  rotates the winding reel  38  under the control of the control device  30 . The control device  30  controls the winding motor  40  to control a rotation direction, a rotation speed, a rotation torque, and the like of the winding reel  38 . 
     In a case in which the magnetic tape MT is wound by the winding reel  38 , the control device  30  rotates the sending motor  36  and the winding motor  40  such that the magnetic tape MT travels along the predetermined path in the forward direction. The rotation speed, the rotation torque, and the like of the sending motor  36  and the winding motor  40  are adjusted in accordance with a speed at which the magnetic tape MT is wound around the winding reel  38 . In addition, by adjusting the rotation speed, the rotation torque, and the like of each of the sending motor  36  and the winding motor  40  by the control device  30 , the tension is applied to the magnetic tape MT. In addition, the tension applied to the magnetic tape MT is controlled by adjusting the rotation speed, the rotation torque, and the like of each of the sending motor  36  and the winding motor  40  by the control device  30 . 
     It should be noted that, in a case in which the magnetic tape MT is rewound to the sending reel  22 , the control device  30  rotates the sending motor  36  and the winding motor  40  such that the magnetic tape MT travels along the predetermined path in the backward direction. 
     In the present embodiment, the tension applied to the magnetic tape MT is controlled by controlling the rotation speed, the rotation torque, and the like of the sending motor  36  and the winding motor  40 , but the technology of the present disclosure is not limited to this. For example, the tension applied to the magnetic tape MT may be controlled by using a dancer roller, or may be controlled by drawing the magnetic tape MT into a vacuum chamber. 
     Each of the plurality of guide rollers GR is a roller which guides the magnetic tape MT. The predetermined path, that is, a traveling path of the magnetic tape MT is determined by separately disposing the plurality of guide rollers GR at positions straddling the magnetic head  28  between the magnetic tape cartridge  12  and the winding reel  38 . 
     The magnetic head  28  comprises a magnetic element unit  42  and a holder  44 . The magnetic element unit  42  is held by the holder  44  to come into contact with the traveling magnetic tape MT. The magnetic element unit  42  includes a plurality of magnetic elements. 
     The magnetic element unit  42  records the data in the magnetic tape MT transported by the transport device  26 , and reads the data from the magnetic tape MT transported by the transport device  26 . Here, the data refers to, for example, a servo pattern  58  (see  FIG.  9   ) and the data other than the servo pattern  58 , that is, the data recorded in a data band DB (see  FIG.  9   ). 
     The magnetic tape drive  14  comprises a noncontact read/write device  46 . The noncontact read/write device  46  is disposed to face a back surface  24 A of the cartridge memory  24  on the lower side of the magnetic tape cartridge  12  in a state in which the magnetic tape cartridge  12  is loaded, and performs the read/write of the information with respect to the cartridge memory  24  in a noncontact manner. 
     As an example, as shown in  FIG.  4   , the noncontact read/write device  46  releases a magnetic field MF from the lower side of the magnetic tape cartridge  12  toward the cartridge memory  24 . The magnetic field MF passes through the cartridge memory  24 . 
     The noncontact read/write device  46  is connected to the control device  30 . The control device  30  outputs a control signal to the noncontact read/write device  46 . The control signal is a signal for controlling the cartridge memory  24 . The noncontact read/write device  46  generates the magnetic field MF in response to the control signal input from the control device  30 , and releases the generated magnetic field MF toward the cartridge memory  24 . 
     The noncontact read/write device  46  performs noncontact communication with the cartridge memory  24  via the magnetic field MF to perform processing on the cartridge memory  24  in response to the control signal. For example, the noncontact read/write device  46  selectively performs, under the control of the control device  30 , processing of reading the information from the cartridge memory  24  and processing of storing the information in the cartridge memory  24  (that is, processing of writing the information to the cartridge memory  24 ). 
     As an example, as shown in  FIG.  5   , the magnetic tape drive  14  comprises a moving mechanism  48 . The moving mechanism  48  includes a movement actuator  48 A. Examples of the movement actuator  48 A include a voice coil motor and/or a piezo actuator. The movement actuator  48 A is connected to the control device  30 , and the control device  30  controls the movement actuator  48 A. The movement actuator  48 A generates power under the control of the control device  30 . The moving mechanism  48  moves the magnetic head  28  in the width direction of the magnetic tape MT by receiving the power generated by the movement actuator  48 A. 
     The magnetic tape drive  14  comprises an inclination mechanism  49 . The inclination mechanism  49  includes an inclination actuator  49 A. Examples of the inclination actuator  49 A include a voice coil motor and/or a piezo actuator. The inclination actuator  49 A is connected to the control device  30 , and the control device  30  controls the inclination actuator  49 A. The inclination actuator  49 A generates power under the control of the control device  30 . The inclination mechanism  49  inclines the magnetic head  28  to a longitudinal direction LD side of the magnetic tape MT with respect to a width direction WD of the magnetic tape MT by receiving the power generated by the inclination actuator  49 A (see  FIG.  8   ). That is, the magnetic head  28  is skewed on the magnetic tape MT under the control of the control device  30 . 
     Here, as a comparative example with respect to the magnetic tape MT, a case in which a known magnetic tape MT 0  in the related art is used instead of the magnetic tape MT will be described with reference to  FIGS.  6  to  8   . It should be noted that, in a case in which the magnetic tape MT 0  and the magnetic tape MT are compared, there is a difference in that the servo pattern  52  (see  FIG.  6   ) is applied to the magnetic tape MT 0 , whereas the servo pattern  58  (see  FIG.  9   ) is applied to the magnetic tape MT. 
     As an example, as shown in  FIG.  6   , on the front surface  31  of the magnetic tape MT 0 , servo bands SB 1 , SB 2 , and SB 3  are data bands DB 1  and DB 2  are formed. It should be noted that, in the following, for convenience of description, in a case in which the distinction is not specifically needed, the servo bands SB 1  to SB 3  are referred to as a servo band SB, and the data bands DB 1  and DB 2  are referred to as the data band DB. 
     The servo bands SB 1  to SB 3  and the data bands DB 1  and DB 2  are formed along the longitudinal direction LD (that is, a total length direction) of the magnetic tape MT 0 . Here, the total length direction of the magnetic tape MT 0  refers to the traveling direction of the magnetic tape MT 0 , in other words. The traveling direction of the magnetic tape MT 0  is defined in two directions of the forward direction which is a direction in which the magnetic tape MT 0  travels from the sending reel  22  side to the winding reel  38  side (hereinafter, also simply referred to as “forward direction”), and the backward direction which is a direction in which the magnetic tape MT 0  travels from the winding reel  38  side to the sending reel  22  side (hereinafter, also simply referred to as “backward direction”). 
     The servo bands SB 1  to SB 3  are arranged at positions spaced in the width direction WD of the magnetic tape MT 0  (hereinafter, also simply referred to as “width direction WD”). For example, the servo bands SB 1  to SB 3  are arranged at equal intervals along the width direction WD. It should be noted that, in the present embodiment, “equal interval” refers to the equal interval in the sense of including an error generally allowed in the technical field to which the technology of the present disclosure belongs, which is the error to the extent that it does not contradict the purpose of the technology of the present disclosure, in addition to the exact equal interval. 
     The data band DB 1  is disposed between the servo band SB 1  and the servo band SB 2 , and the data band DB 2  is disposed between a servo band SB 2  and a servo band SB 3 . That is, the servo bands SB and the data bands DB are arranged alternately along the width direction WD. 
     It should be noted that, in the example shown in  FIG.  6   , for convenience of description, three servo bands SB and two data bands DB are shown, but these are merely examples, and two servo bands SB and one data band DB may be used, and the technology of the present disclosure is established even in a case in which four or more servo bands SB and three or more data bands DB are used. 
     A plurality of servo patterns  52  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT 0 . The servo patterns  52  are classified into a servo pattern  52 A and a servo pattern  52 B. The plurality of servo patterns  52  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT 0 . It should be noted that, in the present embodiment, “regular” refers to the regularity in the sense of including an error generally allowed in the technical field to which the technology of the present disclosure belongs, which is the error to the extent that it does not contradict the purpose of the technology of the present disclosure, in addition to the exact regularity. 
     In the servo band SB, the adjacent servo patterns  52  are a set. In the example shown in  FIG.  6   , the servo patterns  52 A and  52 B are shown as an example of the set of servo patterns  52 . In the set of the servo patterns  52 , the servo pattern  52 A is positioned on an upstream side in the forward direction, and the servo pattern  52 B is positioned on a downstream side in the forward direction. 
     The servo pattern  52  consists of a linear magnetization region pair  54 . The linear magnetization region pair  54  is classified into a linear magnetization region pair  54 A and a linear magnetization region pair  54 B. 
     The servo pattern  52 A consists of the linear magnetization region pair  54 A. In the example shown in  FIG.  6   , linear magnetization regions  54 A 1  and  54 A 2  are shown as an example of the linear magnetization region pair  54 A. Each of the linear magnetization regions  54 A 1  and  54 A 2  is a linearly magnetized region. 
     The linear magnetization regions  54 A 1  and  54 A 2  are inclined in opposite directions with respect to an imaginary straight line C 1  which is an imaginary straight line along the width direction WD. In the example shown in  FIG.  6   , the linear magnetization regions  54 A 1  and  54 A 2  are inclined line-symmetrically with respect to the imaginary straight line C 1 . More specifically, the linear magnetization regions  54 A 1  and  54 A 2  are formed in a state of being not parallel to each other and being inclined at a predetermined angle (for example, 5 degrees) in opposite directions on the longitudinal direction LD side of the magnetic tape MT 0  with the imaginary straight line C 1  as the symmetry axis. In the present embodiment, the imaginary straight line C 1  is an example of a “first imaginary straight line” according to the technology of the present disclosure. 
     The linear magnetization region  54 A 1  is a set of magnetization straight lines  54 A 1   a , which are five magnetized straight lines. The linear magnetization region  54 A 2  is a set of magnetization straight lines  54 A 2   a , which are five magnetized straight lines. 
     The servo pattern  52 B consists of the linear magnetization region pair  54 B. In the example shown in  FIG.  6   , linear magnetization regions  54 B 1  and  54 B 2  are shown as an example of the linear magnetization region pair  54 B. Each of the linear magnetization regions  54 B 1  and  54 B 2  is a linearly magnetized region. 
     The linear magnetization regions  54 B 1  and  54 B 2  are inclined in opposite directions with respect to an imaginary straight line C 2  which is an imaginary straight line along the width direction WD. In the example shown in  FIG.  6   , the linear magnetization regions  54 B 1  and  54 B 2  are inclined line-symmetrically with respect to the imaginary straight line C 2 . More specifically, the linear magnetization regions  54 B 1  and  54 B 2  are formed in a state of being not parallel to each other and being inclined at a predetermined angle (for example, 5 degrees) in opposite directions on the longitudinal direction LD side of the magnetic tape MT 0  with the imaginary straight line C 2  as the symmetry axis. In the present embodiment, the imaginary straight line C 2  is an example of a “first imaginary straight line” according to the technology of the present disclosure. 
     The linear magnetization region  54 B 1  is a set of magnetization straight lines  54 B 1   a , which are four magnetized straight lines. The linear magnetization region  54 B 2  is a set of magnetization straight lines  54 B 2   a , which are four magnetized straight lines. 
     The magnetic head  28  is disposed on the front surface  31  side of the magnetic tape MT 0  configured as described above. The holder  44  is formed in a rectangular parallelepiped shape, and is disposed to cross the front surface  31  of the magnetic tape MT 0  along the width direction WD. The plurality of magnetic elements of the magnetic element unit  42  are arranged in a straight line along the longitudinal direction of the holder  44 . The magnetic element unit  42  has a pair of servo reading elements SR and a plurality of data read/write elements DRW as the plurality of magnetic elements. A length of the holder  44  in the longitudinal direction is sufficiently long with respect to the width of the magnetic tape MT 0 . For example, the length of the holder  44  in the longitudinal direction is set to a length exceeding the width of the magnetic tape MT 0  even in a case in which the magnetic element unit  42  is disposed at any position on the magnetic tape MT. The servo reading element SR is an example of a “servo reading element” according to the technology of the present disclosure. 
     The pair of servo reading elements SR consists of servo reading elements SR 1  and SR 2 . The servo reading element SR 1  is disposed at one end of the magnetic element unit  42 , and the servo reading element SR 2  is disposed at the other end of the magnetic element unit  42 . In the example shown in  FIG.  6   , the servo reading element SR 1  is provided at a position corresponding to the servo band SB 2 , and the servo reading element SR 2  is provided at a position corresponding to the servo band SB 3 . 
     The plurality of data read/write elements DRW are disposed in a straight line between the servo reading element SR 1  and the servo reading element SR 2 . The plurality of data read/write elements DRW are disposed at intervals along the longitudinal direction of the magnetic head  28  (for example, are disposed at equal intervals along the longitudinal direction of the magnetic head  28 ). In the example shown in  FIG.  6   , the plurality of data read/write elements DRW are provided at positions corresponding to the data band DB 2 . 
     The control device  30  acquires a servo pattern signal which is a result of reading the servo pattern  52  by the servo reading element SR, and performs a servo control in response to the acquired servo pattern signal. Here, the servo control refers to a control of moving the magnetic head  28  in the width direction WD of the magnetic tape MT 0  by operating the moving mechanism  48  in accordance with the servo pattern  52  read by the servo reading element SR. 
     By performing the servo control, the plurality of data read/write elements DRW are positioned on a designated region in the data band DB, and perform the magnetic processing on the designated region in the data band DB. In the example shown in  FIG.  6   , the plurality of data read/write elements DRW perform the magnetic processing on the designated region in the data band DB 2 . 
     In addition, in a case in which the data band DB of which the data is to be read by the magnetic element unit  42  is changed (in the example shown in  FIG.  6   , the data band DB of which the data is to be read by the magnetic element unit  42  is changed from the data band DB 2  to the data band DB 1 ), the moving mechanism  48  moves, under the control of the control device  30 , the magnetic head  28  in the width direction WD to change the position of the pair of servo reading elements SR. That is, by moving the magnetic head  28  in the width direction WD, the moving mechanism  48  moves the servo reading element SR 1  to a position corresponding to the servo band SB 1  and moves the servo reading element SR 2  to the position corresponding to the servo band SB 2 . As a result, the positions of the plurality of data read/write elements DRW are changed from the data band DB 2  to the data band DB 1 , and the plurality of data read/write elements DRW perform the magnetic processing on the data band DB 1 . 
     By the way, in recent years, research on a technology of reducing the influence of transverse dimensional stability (TDS) has been advanced. It has been known that the TDS is affected by a temperature, humidity, a pressure at which the magnetic tape is wound around the reel, temporal deterioration, or the like, the TDS is increased in a case in which no measures are taken, and off-track (that is, misregistration of the data read/write element DRW with respect to the track in the data band DB) occurs in a scene in which the magnetic processing is performed on the data band DB. 
     In the example shown in  FIG.  7   , an aspect is shown in which the width of the magnetic tape MT 0  contracts with the elapse of time. In this case, the off-track occurs. In some cases, the width of the magnetic tape MT 0  expands, and the off-track occurs in this case as well. That is, in a case in which the width of the magnetic tape MT 0  contracts or expands with the elapse of time, the position of the servo reading element SR with respect to the servo pattern  52  diverges from a predetermined position (for example, the center position of each of the linear magnetization regions  54 A 1 ,  54 A 2 ,  54 B 1 , and  54 B 2 ) determined by design in the width direction WD. In a case in which the position of the servo reading element SR with respect to the servo pattern  52  diverges from the predetermined position determined by the design in the width direction WD, the accuracy of the servo control is deteriorated, and the position of the track in the data band DB and the position of the data read/write element DRW deviate from each other. Then, an originally planned track will not be subjected to the magnetic processing. 
     As a method of reducing the influence of the TDS, as shown in  FIG.  8    as an example, a method of holding the position of the servo reading element SR with respect to the servo pattern  52  at the predetermined position determined by design by skewing the magnetic head  28  on the magnetic tape MT 0  is known. 
     The magnetic head  28  comprises a rotation axis RA. The rotation axis RA is provided at a position corresponding to a center portion of the magnetic element unit  42  provided in the magnetic head  28  in a plan view. The magnetic head  28  is rotatably held by the inclination mechanism  49  via the rotation axis RA. An imaginary straight line C 3  which is an imaginary center line is provided in the magnetic head  28 . The imaginary straight line C 3  is a straight line that passes through the rotation axis RA and extends in the longitudinal direction of the magnetic head  28  in a plan view (that is, the direction in which the plurality of data read/write elements DRW are arranged). The magnetic head  28  is held by the inclination mechanism  49  to have a posture in which the imaginary straight line C 3  is inclined to the longitudinal direction LD side of the magnetic tape MT 0  with respect to an imaginary straight line C 4  which is an imaginary straight line along the width direction WD. In the example shown in  FIG.  8   , the magnetic head  28  is held by the inclination mechanism  49  in a posture in which the imaginary straight line C 3  is inclined toward the sending reel  22  side with respect to the imaginary straight line C 4  (that is, a posture inclined counterclockwise as viewed from a paper surface side of  FIG.  8   ). 
     The inclination mechanism  49  receives the power from the inclination actuator  49 A (see  FIG.  5   ) to rotate the magnetic head  28  around the rotation axis RA on the front surface  31  of the magnetic tape MT 0 . The inclination mechanism  49  rotates, under the control of the control device  30 , the magnetic head  28  around the rotation axis RA on the front surface  31  of the magnetic tape MT 0  to change the direction of the inclination of the imaginary straight line C 3  with respect to the imaginary straight line C 4  (that is, azimuth) and the inclined angle. 
     By changing the direction of the inclination of the imaginary straight line C 3  with respect to the imaginary straight line C 4  and the inclined angle in accordance with the temperature, the humidity, the pressure at which the magnetic tape MT 0  is wound around the reel, the temporal deterioration, and the like, or expansion and contraction of the magnetic tape MT in the width direction WD due to these, the position of the servo reading element SR with respect to the servo pattern  52  is held at the predetermined position determined in design. 
     By the way, the servo reading element SR is formed in a straight line along the imaginary straight line C 3 . Therefore, in a case in which the servo pattern  52 A is read by the servo reading element SR, in the linear magnetization region pair  54 A, an angle formed by the linear magnetization region  54 A 1  and the servo reading element SR and an angle formed by the linear magnetization region  54 A 2  and the servo reading element SR are different. In a case in which the angles are different in this way, a variation due to an azimuth loss (for example, variation in signal level and waveform distortion) occurs between the servo pattern signal derived from the linear magnetization region  54 A 1  (that is, the servo pattern signal obtained by reading the linear magnetization region  54 A 1  by the servo reading element SR) and the servo pattern signal derived from the linear magnetization region  54 A 2  (that is, the servo pattern signal obtained by reading the linear magnetization region  54 A 2  by the servo reading element SR). In the example shown in  FIG.  8   , since the angle formed by the servo reading element SR and the linear magnetization region  54 A 1  is larger than the angle formed by the servo reading element SR and the linear magnetization region  54 A 2 , the output of the servo pattern signal is small, and the waveform also spreads, so that the variation occurs in the servo pattern signal read by the servo reading element SR across the servo band SB in a state in which the magnetic tape MT travels. In addition, also in a case in which the servo pattern  52 B is read by the servo reading element SR, the variation due to the azimuth loss occurs between the servo pattern signal derived from the linear magnetization region  54 B 1  and the servo pattern signal derived from the linear magnetization region  54 B 2 . Such a variation in the servo pattern signal can contribute to a decrease in the accuracy of the servo control. 
     Therefore, in view of such circumstances, in the present embodiment, as shown in  FIG.  9   , the magnetic tape MT is adopted as an example. The magnetic tape MT is different from the magnetic tape MT 0  in that the servo pattern  58  is provided instead of the servo pattern  52 . A plurality of servo patterns  58  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. The plurality of servo patterns  58  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT, similarly to the plurality of servo patterns  52  recorded in the magnetic tape MT 0 . 
     In the example shown in  FIG.  9   , servo patterns  58 A and  58 B are shown as an example of the set of servo patterns  58 . The servo patterns  58 A and  58 B are adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The servo pattern  58 A is positioned on the upstream side in the forward direction, and the servo pattern  58 B is positioned on the downstream side in the forward direction. 
     The servo pattern  58  consists of a linear magnetization region pair  60 . The linear magnetization region pair  60  is classified into a linear magnetization region pair  60 A and a linear magnetization region pair  60 B. In the present embodiment, the linear magnetization region pair  60  is an example of a “linear magnetization region pair” according to the technology of the present disclosure. 
     The servo pattern  58 A consists of the linear magnetization region pair  60 A. In the example shown in  FIG.  9   , linear magnetization regions  60 A 1  and  60 A 2  are shown as an example of the linear magnetization region pair  60 A. Each of the linear magnetization regions  60 A 1  and  60 A 2  is a linearly magnetized region. 
     In the present embodiment, the linear magnetization region  60 A 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  60 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     The linear magnetization regions  60 A 1  and  60 A 2  are inclined in opposite directions with respect to the imaginary straight line C 1 . The linear magnetization regions  60 A 1  and  60 A 2  are not parallel to each other and are inclined at different angles with respect to the imaginary straight line C 1 . The linear magnetization region  60 A 1  has a steeper inclined angle with respect to the imaginary straight line C 1  than the linear magnetization region  60 A 2 . Here, “steep” means that, for example, an angle of the linear magnetization region  60 A 1  with respect to the imaginary straight line C 1  is smaller than an angle of the linear magnetization region  60 A 2  with respect to the imaginary straight line C 1 . 
     In addition, a total length of the linear magnetization region  60 A 1  is shorter than a total length of the linear magnetization region  60 A 2 . 
     In the servo pattern  58 A, a plurality of magnetization straight lines  60 A 1   a  are included in the linear magnetization region  60 A 1 , and a plurality of magnetization straight lines  60 A 2   a  are included in the linear magnetization region  60 A 2 . The number of the magnetization straight lines  60 A 1   a  included in the linear magnetization region  60 A 1  is the same as the number of the magnetization straight lines  60 A 2   a  included in the linear magnetization region  60 A 2 . 
     The linear magnetization region  60 A 1  is a set of magnetization straight lines  60 A 1   a , which are five magnetized straight lines, and the linear magnetization region  60 A 2  is a set of magnetization straight lines  60 A 2   a , which are five magnetized straight lines. In the servo band SB, the positions of both ends of the linear magnetization region  60 A 1  (that is, the positions of both ends of each of the five magnetization straight lines  60 A 1   a ) and the positions of both ends of the linear magnetization region  60 A 2  (that is, the positions of both ends of each of the five magnetization straight lines  60 A 2   a ) are aligned in the width direction WD. It should be noted that, here, the example has been described in which the positions of both ends of each of the five magnetization straight lines  60 A 1   a  and the positions of both ends of each of the five magnetization straight lines  60 A 2   a  are aligned, but this is merely an example, and the positions of both ends of one or more magnetization straight lines  60 A 1   a  among the five magnetization straight lines  60 A 1   a  and the positions of both ends of one or more magnetization straight lines  60 A 2   a  among of the five magnetization straight lines  60 A 2   a  need only be aligned. In addition, in the present embodiment, the concept of “aligned” also includes meaning of “aligned” including an error generally allowed in the technical field to which the technology of the present disclosure belongs, which is the error to the extent that it does not contradict the purpose of the technology of the present disclosure, in addition to the meaning of being exactly aligned. 
     The servo pattern  58 B consists of the linear magnetization region pair  60 B. In the example shown in  FIG.  9   , linear magnetization regions  60 B 1  and  60 B 2  are shown as an example of the linear magnetization region pair  60 B. Each of the linear magnetization regions  60 B 1  and  60 B 2  is a linearly magnetized region. 
     In the present embodiment, the linear magnetization region  60 B 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  60 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     The linear magnetization regions  60 B 1  and  60 B 2  are inclined in opposite directions with respect to the imaginary straight line C 2 . The linear magnetization regions  60 B 1  and  60 B 2  are not parallel to each other and are inclined at different angles with respect to the imaginary straight line C 2 . The linear magnetization region  60 B 1  has a steeper inclined angle with respect to the imaginary straight line C 2  than the linear magnetization region  60 B 2 . Here, “steep” means that, for example, an angle of the linear magnetization region  60 B 1  with respect to the imaginary straight line C 2  is smaller than an angle of the linear magnetization region  60 B 2  with respect to the imaginary straight line C 2 . 
     In addition, a total length of the linear magnetization region  60 B 1  is shorter than a total length of the linear magnetization region  60 B 2 . 
     In the servo pattern  58 B, a plurality of magnetization straight lines  60 B 1   a  are included in the linear magnetization region  60 B 1 , and a plurality of magnetization straight lines  60 B 2   a  are included in the linear magnetization region  60 B 2 . The number of the magnetization straight lines  60 B 1   a  included in the linear magnetization region  60 B 1  is the same as the number of the magnetization straight lines  60 B 2   a  included in the linear magnetization region  60 B 2 . 
     The total number of the magnetization straight lines  60 B 1   a  and  60 B 2   a  included in the servo pattern  58 B is different from the total number of the magnetization straight lines  60 A 1   a  and  60 A 2   a  included in the servo pattern  58 A. In the example shown in  FIG.  9   , the total number of the magnetization straight lines  60 A 1   a  and  60 A 2   a  included in the servo pattern  58 A is ten, whereas the total number of the magnetization straight lines  60 B 1   a  and  60 B 2   a  included in the servo pattern  58 B is eight. 
     The linear magnetization region  60 B 1  is a set of magnetization straight lines  60 B 1   a , which are four magnetized straight lines, and the linear magnetization region  60 B 2  is a set of magnetization straight lines  60 B 2   a , which are four magnetized straight lines. In the servo band SB, the positions of both ends of the linear magnetization region  60 B 1  (that is, the positions of both ends of each of the four magnetization straight lines  60 B 1   a ) and the positions of both ends of the linear magnetization region  60 B 2  (that is, the positions of both ends of each of the four magnetization straight lines  60 B 2   a ) are aligned in the width direction WD. 
     It should be noted that, here, the example has been described in which the positions of both ends of each of the four magnetization straight lines  60 B 1   a  and the positions of both ends of each of the four magnetization straight lines  60 B 2   a  are aligned, but this is merely an example, and the positions of both ends of one or more magnetization straight lines  60 B 1   a  among the four magnetization straight lines  60 B 1   a  and the positions of both ends of one or more magnetization straight lines  60 B 2   a  among of the four magnetization straight lines  60 B 2   a  need only be aligned. 
     In addition, here, the set of magnetization straight lines  60 A 1   a , which are five magnetized straight lines, is described as an example of the linear magnetization region  60 A 1 , the set of magnetization straight lines  60 A 2   a , which are five magnetized straight lines, is described as an example of the linear magnetization region  60 A 2 , the set of magnetization straight lines  60 B 1   a , which are four magnetized straight lines, is described as an example of the linear magnetization region  60 B 1 , and the set of magnetization straight lines  60 B 2   a , which are four magnetized straight lines, is described as an example of the linear magnetization region  60 B 2 , but the technology of the present disclosure is not limited thereto. For example, the linear magnetization region  60 A 1  need only have the number of the magnetization straight lines  60 A 1   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT, the linear magnetization region  60 A 2  need only have the number of the magnetization straight lines  60 A 2   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT, the linear magnetization region  60 B 1  need only have the number of the magnetization straight lines  60 B 1   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT, and the linear magnetization region  60 B 2  need only have the number of the magnetization straight lines  60 B 2   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT. 
     Here, the geometrical characteristic of the linear magnetization region pair  60 A on the magnetic tape MT will be described with reference to  FIG.  10   . It should be noted that, in the present embodiment, the geometrical characteristic refers to a generally recognized geometrical characteristic, such as a length, a shape, an orientation, and/or a position. 
     As an example, as shown in  FIG.  10   , the geometrical characteristic of the linear magnetization region pair  60 A on the magnetic tape MT can be expressed by using an imaginary linear region pair  62 . The imaginary linear region pair  62  consists of an imaginary linear region  62 A and an imaginary linear region  62 B. The geometrical characteristic of the linear magnetization region pair  60 A on the magnetic tape MT corresponds to the geometrical characteristic based on the imaginary linear region pair  62  inclined line-symmetrically with respect to the imaginary straight line C 1  in a case in which an entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining a symmetry axis SA 1  of the imaginary linear region  62 A and the imaginary linear region  62 B with respect to the imaginary straight line C 1 . 
     In the present embodiment, the imaginary linear region pair  62  is an example of a “pair of imaginary linear regions” according to the technology of the present disclosure, the imaginary linear region  62 A is an example of “one imaginary linear region” according to the technology of the present disclosure, and the imaginary linear region  62 B is an example of “the other imaginary linear region” according to the technology of the present disclosure. 
     The imaginary linear region pair  62  is an imaginary linear magnetization region pair having the same geometrical characteristic as the linear magnetization region pair  54 A shown in  FIG.  6   . The imaginary linear region pair  62  is an imaginary magnetization region used for convenience for describing the geometrical characteristic of the linear magnetization region pair  60 A on the magnetic tape MT, and is not an actually present magnetization region. 
     The imaginary linear region  62 A has the same geometrical characteristic as the linear magnetization region  54 A 1  shown in  FIG.  6   , and consists of five imaginary straight lines  62 A 1  corresponding to the five magnetization straight lines  54 A 1   a  shown in  FIG.  6   . The imaginary linear region  62 B has the same geometrical characteristic as the linear magnetization region  54 B 1  shown in  FIG.  6   , and consists of five imaginary straight lines  62 B 1  corresponding to the five magnetization straight lines  54 A 2   a  shown in  FIG.  6   . 
     A center O 1  is provided in the imaginary linear region pair  62 . For example, the center O 1  is a center of a line segment LO connecting a center of the straight line  62 A 1  positioned on the most upstream side of the five straight lines  62 A 1  in the forward direction and a center of the straight line  62 B 1  positioned on the most downstream side of the five straight lines  62 B 1  in the forward direction. 
     Since the imaginary linear region pair  62  has the same geometrical characteristic as the linear magnetization region pair  54 A shown in  FIG.  6   , the imaginary linear region  62 A and the imaginary linear region  62 B are inclined line-symmetrically with respect to the imaginary straight line C 1 . Here, a case will be considered in which reading by the servo reading element SR is performed tentatively with respect to the imaginary linear region pair  62  in a case in which the entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining the symmetry axis SA 1  of the imaginary linear regions  62 A and  62 B at an angle α (for example, 10 degrees) with respect to the imaginary straight line C 1  with the center O 1  as the rotation axis. In this case, in the imaginary linear region pair  62 , in the width direction WD, a portion is generated in which the imaginary linear region  62 A is read but the imaginary linear region  62 B is not read or the imaginary linear region  62 A is not read is read but the imaginary linear region  62 B. That is, in each of the imaginary linear regions  62 A and  62 B, in a case in which reading by the servo reading element SR is performed, a shortage part and an unnecessary part is generated. 
     Therefore, by compensating for the shortage part and removing the unnecessary part, the positions of both ends of the imaginary linear region  62 A (that is, the positions of both ends of each of the five straight lines  62 A 1 ) and the positions of both ends of the imaginary linear region  62 B (that is, the positions of both ends of each of the five straight lines  62 B 1 ) are aligned in the width direction WD. 
     The geometrical characteristic of the imaginary linear region pair  62  (that is, the geometrical characteristic of the imaginary servo pattern) obtained as described above corresponds to the geometrical characteristic of the actual servo pattern  58 A. That is, the linear magnetization region pair  60 A having the geometrical characteristic corresponding to the geometrical characteristic of the imaginary linear region pair  62  obtained by aligning the positions of both ends of the imaginary linear region  62 A and the positions of both ends of the imaginary linear region  62 B in the width direction WD is recorded in the servo band SB. 
     Here, the inclination of the geometrical characteristic of the linear magnetization region pair  60 A with respect to the imaginary straight line C 1  will be described with reference to  FIG.  11   . The geometrical characteristic of the linear magnetization region pair  60 A corresponds to the geometrical characteristic of the imaginary linear region pair  62 . Therefore, similarly to the imaginary linear region pair  62 , the linear magnetization region pair  60 A is obtained by inclining a symmetry axis SA 2  of the linear magnetization regions  60 A 1  and  60 B 2  at an angle α (that is, corresponding to the angle a) with respect to the imaginary straight line C 1  with the center O 1  as the rotation axis. That is, the entirety of the linear magnetization region pair  60 A is inclined by the angle α with respect to the imaginary straight line C 1 . Therefore, the servo pattern  58  including the linear magnetization region pair  60 A is also inclined at the angle α (hereinafter, referred to as an inclined angle α of the servo pattern  58 ) with respect to the imaginary straight line C 1 . 
     Further, the linear magnetization region  60 A 1  of the linear magnetization region pair  60 A is inclined at an angle θa (hereinafter, referred to as an inclined angle θa of the linear magnetization region  60 A 1 ) with respect to the imaginary straight line C 1 . In addition, the linear magnetization region  60 A 2  of the linear magnetization region pair  60 A is inclined at an angle θb (hereinafter, referred to as an inclined angle θb of the linear magnetization region  60 A 2 ) with respect to the imaginary straight line C 1 . Both the inclined angle θa of the linear magnetization region  60 A 1  and the inclined angle θb of the linear magnetization region  60 A 2  correspond to the inclined angle α of the servo pattern  58 . 
     It should be noted that the linear magnetization region pair  60 B is different from the linear magnetization region pair  60 A only in that the four magnetization straight lines  60 B 1   a  are provided instead of the five magnetization straight lines  60 A 1   a  and the four magnetization straight lines  60 B 2   a  are provided instead of the five magnetization straight lines  60 A 2   a . Therefore, the linear magnetization region pair  60 B having the geometrical characteristic corresponding to the geometrical characteristic of the imaginary linear region pair (not shown) obtained by aligning the positions of both ends of each of the four straight lines  62 A 1  and the positions of both ends of each of the four straight lines  62 B 1  in the width direction WD is recorded in the servo band SB. 
     As an example, as shown in  FIG.  12   , in a case in which the servo pattern  58 A (that is, the linear magnetization region pair  60 A) is read by the servo reading element SR in a state in which the direction of the imaginary straight line C 1  and the direction of the imaginary straight line C 3  match (that is, a state in which the longitudinal direction of the magnetic head  28  and the width direction WD match), the variation due to the azimuth loss occurs between the servo pattern signal derived from the linear magnetization region  60 A 1  and the servo pattern signal derived from the linear magnetization region  60 A 2 . In addition, also in a case in which the servo pattern  58 B (that is, the linear magnetization region pair  60 B) is read by the servo reading element SR in a state in which the direction of the imaginary straight line C 1  and the direction of the imaginary straight line C 3  match (that is, a state in which the longitudinal direction of the magnetic head  28  and the width direction WD match), a similar phenomenon occurs. 
     Here, as an example, as shown in  FIG.  13   , the inclination mechanism  49  (see  FIG.  8   ) skews the magnetic head  28  on the magnetic tape MT around the rotation axis RA such that the imaginary straight line C 3  is inclined with respect to the imaginary straight line C 1  to the upstream side in the forward direction at an angle β (that is, the angle β counterclockwise as viewed from the paper surface side of  FIG.  13   ) (hereinafter, for convenience of description, the angle of the imaginary straight line C 3  with respect to the imaginary straight line C 1  is referred to as “magnetic head skew angle”). Even in this case, in a case in which there is a large deviation between the inclined angle α of the servo pattern  58  and the magnetic head skew angle (for example, the inclined angle α of the servo pattern  58  is 5 degrees and the magnetic head skew angle is 10 degrees), the variation due to the azimuth loss may occur between the servo pattern signals. 
     In the example shown in  FIG.  13   , since the angle formed by the servo reading element SR and the linear magnetization region  60 A 1  is larger than the angle formed by the servo reading element SR and the linear magnetization region  60 A 2 , the output of the servo pattern signal is small, and the waveform also spreads, so that the variation occurs in the servo pattern signal read by the servo reading element SR across the servo band SB in a state in which the magnetic tape MT travels. In addition, also in a case in which the servo pattern  58 B is read by the servo reading element SR, the variation due to the azimuth loss occurs between the servo pattern signal derived from the linear magnetization region  60 B 1  and the servo pattern signal derived from the linear magnetization region  60 B 2 . 
     Therefore, as shown in  FIG.  14    as an example, the control device  30  performs skew angle control of the magnetic head  28  based on servo format information SF of the magnetic tape MT. The servo format information SF is stored in the cartridge memory  24  provided in the magnetic tape cartridge  12 . The control device  30  acquires the servo format information SF from the cartridge memory  24  via the noncontact read/write device  46 . 
     The servo format information SF includes servo pattern inclination information SF 1 . The servo pattern inclination information SF 1  refers to information on the inclination of the servo pattern  58 . Examples of the servo pattern inclination information SF 1  include information indicating the inclined angle α of the servo pattern  58 , but this is merely an example. For example, the servo pattern inclination information SF 1  includes information indicating the angle θa (see  FIG.  11   ) of the linear magnetization region  60 A 1  with respect to the imaginary straight line C 1  and the angle θb (see  FIG.  11   ) of the linear magnetization region  60 A 2  with respect to the imaginary straight line C 1 . Similarly, the servo pattern inclination information SF 1  includes information indicating the angle θa (see  FIG.  11   ) of the linear magnetization region  60 B 1  with respect to the imaginary straight line C 2  and the angle θb (see  FIG.  11   ) of the linear magnetization region  60 B 2  with respect to the imaginary straight line C 2 . 
     The inclined angle α of the servo pattern  58  corresponds to, for example, a skew angle of a servo pattern recording head WH (see  FIG.  18   ) in a case in which the servo pattern  58  is recorded in a manufacturing stage of the magnetic tape MT, and is an angle obtained in the manufacturing stage of the magnetic tape MT, but this is merely an example. For example, the servo pattern inclination information SF 1  may be a design value or an actual measurement value of the inclined angle α of the servo pattern  58  in the manufacturing stage of the magnetic tape MT (for example, the inclined angle α itself of the servo pattern  58  actually recorded in the magnetic tape MT), and may be a result obtained from a simulation and/or an experiment related to a change in the inclined angle α of the servo pattern  58  with a change in the width of the magnetic tape MT. In addition, the servo pattern inclination information SF 1  may be the inclined angle α of the servo pattern  58  that is reflected as an image in the image obtained by developing the magnetic tape MT. Further, the servo pattern inclination information SF 1  may be a result of calculating the inclined angle α of the servo pattern  58  based on a measurement result of an amount in which the width of the magnetic tape MT is changed over the total length of the magnetic tape MT (hereinafter, also referred to as “width change amount measurement result”). In this case, the servo pattern inclination information SF 1  may be calculated from a function using a fixed value predetermined as a reference value of the inclined angle α and a variable based on the width change amount measurement result. 
     The control device  30  operates the inclination mechanism  49  based on the servo format information SF. As a result, the magnetic head skew angle is adjusted. For example, the magnetic head skew angle is adjusted to the same angle as the inclined angle α of the servo pattern  58 . In addition, in the present embodiment, the concept of “same” also includes meaning of “same” including an error generally allowed in the technical field to which the technology of the present disclosure belongs, which is the error to the extent that it does not contradict the purpose of the technology of the present disclosure, in addition to the meaning of exactly the same. 
     In addition, the magnetic head skew angle may be adjusted to an angle at which the azimuth loss falls within an allowable range (hereinafter, also simply referred to as “allowable range”). Here, the allowable range refers to a range in which the accuracy of detection of the servo pattern  58  is equal to or higher than a certain level. In a case in which the magnetic head skew angle falls within the allowable range in this way, for example, the control device  30  need only derive the angle falling within the allowable range as the magnetic head skew angle with reference to the servo format information SF. It should be noted that the angle falling within the allowable range need only be derived from, for example, a table or an arithmetic expression in which the servo format information SF and the magnetic head skew angle are associated with each other. 
     As an example, as shown in  FIG.  15   , the inclination mechanism  49  skews the magnetic head  28  on the magnetic tape MT around the rotation axis RA such that the imaginary straight line C 3  is inclined with respect to the imaginary straight line C 1  to the upstream side in the forward direction at an angle γ (that is, the angle γ counterclockwise as viewed from the paper surface side of  FIG.  15   ). In this way, the magnetic head  28  is inclined at the angle γ to the upstream side in the forward direction on the magnetic tape MT. Here, the angle γ is the same as the inclined angle α of the servo pattern  58 . As a result, than in the examples shown in  FIGS.  12  and  13   , the variation due to the azimuth loss between the servo pattern signal derived from the linear magnetization region  60 A 1  and the servo pattern signal derived from the linear magnetization region  60 A 2  is smaller. In addition, also in a case in which the servo pattern  58 B (that is, the linear magnetization region pair  60 B) is read by the servo reading element SR, similarly, the variation due to the azimuth loss between the servo pattern signal derived from the linear magnetization region  60 B 1  and the servo pattern signal derived from the linear magnetization region  60 B 2  is small. 
     As an example, as shown in  FIG.  16   , the control device  30  includes a controller  30 A and a position detection unit  30 B. The position detection unit  30 B includes a first position detection unit  30 B 1  and a second position detection unit  30 B 2 . The position detection unit  30 B acquires a servo band signal S that is a result of reading the servo band SB by the servo reading element SR, and detects the position of the magnetic head  28  on the magnetic tape MT based on the acquired servo band signal S. The servo band signal S includes a signal (for example, noise) unnecessary for the servo control in addition to the servo pattern signal which is the result of reading the servo pattern  58 . Therefore, in order to realize the control based on the servo pattern signal (for example, servo control) with high accuracy, the control device  30  needs to detect the servo pattern signal from the servo band signal S with high accuracy. 
     The servo band signal S is classified into a first servo band signal S 1  and a second servo band signal S 2 . The first servo band signal S 1  is the servo band signal S which is a result of reading the servo band SB 2  by the servo reading element SR 1 , and the second servo band signal S 2  is the servo band signal S which is a result of reading the servo band SB 3  by the servo reading element SR 2 . 
     The first position detection unit  30 B 1  acquires the first servo band signal S 1 , and the second position detection unit  30 B 2  acquires the second servo band signal S 2 . In the example shown in  FIG.  16   , the first position detection unit  30 B 1  acquires the first servo band signal S 1  obtained by reading the servo band SB 2  by the servo reading element SR 1 , and the second position detection unit  30 B 2  acquires the second servo band signal S 2  obtained by reading the servo band SB 3  by the servo reading element SR 2 . The first position detection unit  30 B 1  detects the position of the servo reading element SR 1  with respect to the servo band SB 2  based on the first servo band signal S 1 , and the second position detection unit  30 B 2  detects the position of the servo reading element SR 2  with respect to the servo band SB 3  based on the second servo band signal S 2 . 
     The controller  30 A performs various controls based on a position detection result by the first position detection unit  30 B 1  (that is, a result of detecting the position by the first position detection unit  30 B 1 ) and a position detection result by the second position detection unit  30 B 2  (that is, a result of detecting the position by the second position detection unit  30 B 2 ). Here, the various controls refer to, for example, the servo control, a skew angle control, and/or a tension control. The tension control refers to a control of the tension applied to the magnetic tape MT (for example, the tension for reducing the influence of the TDS). 
     As an example, as shown in  FIG.  17   , the position detection unit  30 B detects the servo pattern signal, which is the result of reading the servo pattern  58  from the magnetic tape MT by the servo reading element SR, by using an autocorrelation coefficient. 
     An ideal waveform signal  66  is stored in the cartridge memory  24 . That is, the servo format information SF stored in the cartridge memory  24  includes the ideal waveform signal  66 . The ideal waveform signal  66  is a signal indicating a single ideal waveform included in the servo band signal S (for example, an ideal signal which is a result of reading one of ideal magnetization straight lines included in the servo pattern  58  by the servo reading element SR). The ideal waveform signal  66  can be said to be a sample signal compared with the servo band signal S. It should be noted that, here, the form example has been described in which the ideal waveform signal  66  is stored in the cartridge memory  24 , but this is merely an example. For example, the ideal waveform signal  66  may be stored in the storage  32  together with the cartridge memory  24 . In addition, the ideal waveform signal  66  may be recorded in a BOT region MT 1  (see  FIG.  41   ) provided at the beginning of the magnetic tape MT and/or in an EOT region MT 2  (see  FIG.  41   ) provided at the end of the magnetic tape MT. 
     The autocorrelation coefficient used by the position detection unit  30 B is a coefficient indicating a degree of correlation between the servo band signal S and the ideal waveform signal  66 . The position detection unit  30 B acquires the ideal waveform signal  66  from the storage  32  to compare the acquired ideal waveform signal  66  with the servo band signal S. Moreover, the position detection unit  30 B calculates the autocorrelation coefficient based on the comparison result. The position detection unit  30 B detects a position on the servo band SB at which the correlation between the servo band signal S and the ideal waveform signal  66  is high (for example, a position at which the servo band signal S and the ideal waveform signal  66  match) in accordance with the autocorrelation coefficient. 
     The position of the servo reading element SR with respect to the servo band SB is detected based on, for example, an interval between the servo patterns  58 A and  58 B in the longitudinal direction LD. For example, the interval between the servo patterns  58 A and  58 B in the longitudinal direction LD is detected in accordance with the autocorrelation coefficient. In a case in which the servo reading element SR is positioned on the upper side of the servo pattern  58  (that is, the upper side in the front view of the paper in  FIG.  16   ), an interval between the linear magnetization region  60 A 1  and the linear magnetization region  60 A 2  is narrowed, and an interval between the linear magnetization region  60 B 1  and the linear magnetization region  60 B 2  is also narrowed. On the other hand, in a case in which the servo reading element SR is positioned on the lower side of the servo pattern  58  (that is, the lower side in the front view of the paper in  FIG.  16   ), the interval between the linear magnetization region  60 A 1  and the linear magnetization region  60 A 2  is widened, and the interval between the linear magnetization region  60 B 1  and the linear magnetization region  60 B 2  is also widened. As described above, the position detection unit  30 B detects the position of the servo reading element SR with respect to the servo band SB by using the interval between the linear magnetization region  60 A 1  and the linear magnetization region  60 A 2  and the interval between the linear magnetization region  60 B 1  and the linear magnetization region  60 B 2  detected in accordance with the autocorrelation coefficient. 
     The controller  30 A adjusts the position of the magnetic head  28  by operating the moving mechanism  48  based on the position detection result of the position detection unit  30 B (that is, the result of detecting the position by the position detection unit  30 B). In addition, the controller  30 A causes the magnetic element unit  42  to perform the magnetic processing on the data band DB of the magnetic tape MT. That is, the controller  30 A acquires a read signal (that is, data read from the data band DB of the magnetic tape MT by the magnetic element unit  42 ) from the magnetic element unit  42 , or supplies a recording signal to the magnetic element unit  42  to record the data in response to the recording signal in the data band DB of the magnetic tape MT. 
     In addition, in order to reduce the influence of the TDS, the controller  30 A calculates the servo band pitch from the position detection result of the position detection unit  30 B, and performs the tension control in accordance with the calculated servo band pitch, or skews the magnetic head  28  on the magnetic tape MT. The tension control is realized by adjusting the rotation speed, rotation torque, and the like of each of the sending motor  36  and the winding motor  40 . The skew of the magnetic head  28  is realized by operating the inclination mechanism  49 . 
     Next, among a plurality of steps included in a manufacturing process of the magnetic tape MT, an example of a servo pattern recording step of recording the servo pattern  58  on the servo band SB of the magnetic tape MT and an example of a winding step of winding the magnetic tape MT will be described. 
     As an example, as shown in  FIG.  18   , a servo writer SW is used in the servo pattern recording step. The servo writer SW comprises a sending reel SW 1 , a winding reel SW 2 , a driving device SW 3 , a pulse signal generator SW 4 , a servo writer controller SW 5 , a plurality of guides SW 6 , a transport passage SW 7 , a servo pattern recording head WH, and a verification head VH. 
     The servo writer controller SW 5  controls the entirety of the servo writer SW. In the present embodiment, although the servo writer controller SW 5  is realized by an ASIC, the technology of the present disclosure is not limited to this. For example, the servo writer controller SW 5  may be realized by an FPGA and/or a PLC. In addition, the servo writer controller SW 5  may be realized by the computer including a CPU, a flash memory (for example, an EEPROM and/or an SSD), and a RAM. In addition, the servo writer controller SW 5  may be realized by combining two or more of an ASIC, an FPGA, a PLC, and a computer. That is, the servo writer controller SW 5  may be realized by a combination of a hardware configuration and a software configuration. 
     A pancake is set in the sending reel SW 1 . The pancake refers to a large-diameter roll in which the magnetic tape MT cut into a product width from a wide web raw material before writing the servo pattern  58  is wound around a hub. 
     The driving device SW 3  has a motor (not shown) and a gear (not shown), and is mechanically connected to the sending reel SW 1  and the winding reel SW 2 . In a case in which the magnetic tape MT is wound by the winding reel SW 2 , the driving device SW 3  generates power in accordance with the command from the servo writer controller SW 5 , and transmits the generated power to the sending reel SW 1  and the winding reel SW 2  to rotate the sending reel SW 1  and the winding reel SW 2 . That is, the sending reel SW 1  receives the power from the driving device SW 3  and is rotated to send the magnetic tape MT to the predetermined transport passage SW 7 . The winding reel SW 2  receives the power from the driving device SW 3  and is rotated to wind the magnetic tape MT sent from the sending reel SW 1 . The rotation speed, the rotation torque, and the like of the sending reel SW 1  and the winding reel SW 2  are adjusted in accordance with a speed at which the magnetic tape MT is wound around the winding reel SW 2 . 
     The plurality of guides SW 6  and the servo pattern recording head WH are disposed on the transport passage SW 7 . The servo pattern recording head WH is disposed on the front surface  31  side of the magnetic tape MT between the plurality of guides SW 6 . The magnetic tape MT sent from the sending reel SW 1  to the transport passage SW 7  is guided by the plurality of guides SW 6  and is wound by the winding reel SW 2  via the servo pattern recording head WH. 
     The manufacturing process of the magnetic tape MT includes a plurality of steps in addition to the servo pattern recording step. The plurality of steps include the inspection step and the winding step. 
     For example, the inspection step is a step of inspecting the servo band SB formed on the front surface  31  of the magnetic tape MT by the servo pattern recording head WH. The inspection of the servo band SB refers to, for example, processing of determining the correctness of the servo pattern  58  recorded in the servo band SB. The determination of the correctness of the servo pattern  58  refers to, for example, the determination (that is, verification of the servo pattern  58 ) whether or not the servo patterns  58 A and  58 B are recorded in a predetermined portion of the front surface  31  without excess or deficiency of the magnetization straight lines  60 A 1   a ,  60 A 2   a ,  60 B 1   a , and  60 B 2   a  and within an allowable error. 
     The inspection step is performed by using the servo writer controller SW 5  and the verification head VH. The verification head VH is disposed on the downstream side of the servo pattern recording head WH in a transport direction of the magnetic tape MT. In addition, the verification head VH includes a plurality of servo reading elements (not shown) similarly to the magnetic head  28 , and the plurality of servo bands SB are read by the plurality of servo reading elements. Further, the verification head VH is skewed on the front surface  31  of the magnetic tape MT, similarly to the magnetic head  28 . It should be noted that the verification head VH is an example of a “magnetic head” according to the technology of the present disclosure. 
     The verification head VH is connected to the servo writer controller SW 5 . The verification head VH is disposed at a position facing the servo band SB as viewed from the front surface  31  side of the magnetic tape MT (that is, the rear surface side of the verification head VH), and reads the servo pattern  58  recorded in the servo band SB, and outputs a reading result (hereinafter, referred to as “servo pattern reading result”) to the servo writer controller SW 5 . The servo writer controller SW 5  inspects the servo band SB (for example, determines the correctness of the servo pattern  58 ) based on the servo pattern reading result (for example, the servo band signal S) input from the verification head VH. For example, the servo writer controller SW 5  is operated as the position detection unit  30 B shown in  FIG.  17    to acquire the position detection result from the servo pattern reading result, and inspects the servo band SB by determining the correctness of the servo pattern  58  by using the position detection result. 
     The servo writer controller SW 5  outputs information indicating the result of inspecting the servo band SB (for example, the result of determining the correctness of the servo pattern  58 ) to a predetermined output destination (for example, the storage  32  (see  FIG.  3   ), the UI system device  34  (see  FIG.  3   ), and/or the external device  37  (see  FIG.  3   )). 
     For example, in a case in which the inspection step is terminated, the winding step is then performed. The winding step is a step of winding the magnetic tape MT around the sending reel  22  (that is, the sending reel  22  (see  FIGS.  2  to  4   ) accommodated in the magnetic tape cartridge  12  (see  FIGS.  1  to  4   )) used for each of the plurality of magnetic tape cartridges  12  (see  FIGS.  1  to  4   ). In the winding step, a winding motor M is used. The winding motor M is mechanically connected to the sending reel  22  via a gear and the like. The winding motor M rotates the sending reel  22  by applying a rotation force to the sending reel  22  under the control of the control device (not shown). The magnetic tape MT wound around the winding reel SW 2  is wound around the sending reel  22  by the rotation of the sending reel  22 . In the winding step, a cutting device (not shown) is used. In a case in which a required amount of the magnetic tape MT is wound around the sending reel  22  for each of the plurality of sending reels  22 , the magnetic tape MT sent from the winding reel SW 2  to the sending reel  22  is cut by the cutting device. 
     The pulse signal generator SW 4  generates the pulse signal under the control of the servo writer controller SW 5 , and supplies the generated pulse signal to the servo pattern recording head WH. In a state in which the magnetic tape MT travels on the transport passage SW 7  at a regular speed, the servo pattern recording head WH records the servo pattern  58  in the servo band SB in response to the pulse signal supplied from the pulse signal generator SW 4 . 
     Next, an action of the magnetic tape system  10  will be described. 
     In the magnetic tape system  10  according to the present embodiment, as shown in  FIG.  19    as an example, servo pattern detection processing is performed by the control device  30  (see  FIG.  3    and the like). It should be noted that a flow of the servo pattern detection processing shown in  FIG.  19    is an example of a “detection method of a servo pattern” according to the technology of the present disclosure. 
     In the servo pattern detection processing shown in  FIG.  19   , first, in step ST 10 , the control device  30  acquires the servo format information SF. For example, the control device  30  acquires the servo format information SF from the cartridge memory  24  via the noncontact read/write device  46 . After the processing of step ST 10  is executed, the servo pattern detection processing proceeds to step ST 12 . 
     In step ST 12 , the control device  30  executes the processing in accordance with the servo format information SF acquired from the cartridge memory  24  in step ST 10 . For example, the control device  30  operates the inclination mechanism  49  based on servo pattern inclination information SF 1  included in the servo format information SF. After the processing of step ST 12  is executed, the servo pattern detection processing is terminated. 
     As described above, the magnetic tape cartridge  12  is loaded into the magnetic tape drive  14 . In the magnetic tape drive  14 , in a case in which the magnetic tape MT is subjected to the magnetic processing by the magnetic element unit  42  (see  FIGS.  3  and  17   ), the magnetic tape MT is pulled out from the magnetic tape cartridge  12 , and the servo pattern  58  in the servo band SB is read by the servo reading element SR of the magnetic head  28 . 
     The cartridge memory  24  is provided in the magnetic tape cartridge  12  according to the present embodiment. The cartridge memory  24  stores the servo format information SF including the servo pattern inclination information SF 1  which is information on the inclination of the servo pattern. The control device  30  operates the inclination mechanism  49  based on the servo format information SF. As a result, the magnetic head skew angle is close to the inclined angle α of the servo pattern  58 . Therefore, with the present configuration, the variation in the servo pattern signal is smaller than in a case in which the servo pattern  58  is read without considering the information on the inclination of the servo pattern  58 , so that the servo pattern signal having high reliability can be obtained. 
     As shown in  FIGS.  9  and  10   , the linear magnetization regions  60 A 1  and  60 A 2  included in the servo pattern  58 A recorded in the servo band SB of the magnetic tape MT are inclined in opposite directions with respect to the imaginary straight line C 1 . On the other hand, as shown in  FIGS.  14  and  15   , the magnetic head  28  is also inclined to the upstream side in the forward direction by the angle γ (that is, the angle γ counterclockwise as viewed from the paper surface side of  FIGS.  14  and  15   ) on the magnetic tape MT. In a case in which the servo pattern  58 A is read by the servo reading element SR in this state, since the angle formed by the linear magnetization region  60 A 1  and the servo reading element SR and the angle formed by the linear magnetization region  60 A 2  and the servo reading element SR are close to each other, the variation in the servo pattern signal due to the azimuth loss is smaller than the variation generated between the servo pattern signal derived from the linear magnetization region  54 A 1  included in the known servo pattern  52 A in the related art and the servo pattern signal derived from the linear magnetization region  54 A 2  included in the known servo pattern  52 A in the related art. 
     As a result, the variation between the servo pattern signal derived from the linear magnetization region  60 A 1  and the servo pattern signal derived from the linear magnetization region  60 A 2  is smaller than the variation generated between the servo pattern signal derived from the linear magnetization region  54 A 1  included in the known servo pattern  52 A in the related art and the servo pattern signal derived from the linear magnetization region  54 A 2  included in the known servo pattern  52 A in the related art, and the servo pattern signal having higher reliability than the servo pattern signal obtained from the known servo pattern  52 A in the related art can be obtained (hereinafter, this effect is also referred to as “first effect”). It should be noted that, as shown in  FIGS.  14  and  15   , also in a case in which the servo pattern  58 B is read by the servo reading element SR in a state in which the magnetic head  28  on the magnetic tape MT is inclined to the upstream side in the forward direction at the angle γ (that is, the angle γ counterclockwise as viewed from the paper surface side of  FIGS.  14  and  15   ), the same effect as the first effect (hereinafter, this effect is also referred to as “second effect”) can be obtained. 
     In addition, the servo pattern inclination information SF 1  stored in the cartridge memory  24  of the magnetic tape cartridge  12  according to the present embodiment includes the information on the angle θa of the linear magnetization region  60 A 1  with respect to the imaginary straight line C 1  and the information on the angle θb of the linear magnetization region  60 A 2  with respect to the imaginary straight line C 1 . Therefore, with the present configuration, in a case in which only the information of the inclined angle of any of the linear magnetization region  60 A 1  or the linear magnetization region  60 A 2  with respect to the imaginary straight line C 1  is considered, the servo pattern signal having higher reliability can be obtained than in a case in which only the information of the inclined angle of any of the linear magnetization region  60 B 1  or the linear magnetization region  60 B 2  with respect to the imaginary straight line C 2  is considered. 
     By the way, in a case in which the positions of both ends of the linear magnetization region  60 A 1  and the positions of both ends of the linear magnetization region  60 A 2  are not aligned in the width direction WD, one end portion of the linear magnetization region  60 A 1  is read by the servo reading element SR, but one end portion of the linear magnetization region  60 A 2  are not read, or the other end portion of the linear magnetization region  60 A 1  is read by the servo reading element SR, but the other end portion of the linear magnetization region  60 A 2  are not read. 
     Therefore, in the magnetic tape MT included in the magnetic tape cartridge  12  according to the present embodiment, in the servo band SB, the positions of both ends of the linear magnetization region  60 A 1  (that is, the positions of both ends of each of the five magnetization straight lines  60 A 1   a ) and the positions of both ends of the linear magnetization region  60 A 2  (that is, the positions of both ends of each of the five magnetization straight lines  60 A 2   a ) are aligned in the width direction WD. Therefore, in a case in which the servo pattern  58 A is read by the servo reading element SR, as compared with a case in which the positions of both ends of the linear magnetization region  60 A 1  and the positions of both ends of the linear magnetization region  60 A 2  are not aligned in the width direction WD, the linear magnetization regions  60 A 1  and  60 A 2  can be read by the servo reading element SR without excess or deficiency. As a result, as compared with a case in which the positions of both ends of the linear magnetization region  60 A 1  and the positions of both ends of the linear magnetization region  60 A 2  are not aligned in the width direction WD, the servo pattern signal having high reliability can be obtained (hereinafter, this effect is referred to as “third effect”). It should be noted that, in a case in which the servo pattern  58 B is read by the servo reading element SR, the same effect as the third effect (hereinafter, this effect is also referred to as “fourth effect”) can be obtained. 
     As shown in  FIGS.  9  and  10   , although the gradient of the linear magnetization region  60 A 1  with respect to the imaginary straight line C 1  is steeper than the gradient of the linear magnetization region  60 A 2  with respect to the imaginary straight line C 1 , in a case in which the total length of the linear magnetization region  60 A 1  is longer than the total length of the linear magnetization region  60 A 2 , a part read by the servo reading element SR and a part that is not read are generated between the linear magnetization region  60 A 1  and the linear magnetization region  60 A 2 . In addition, even in a case in which the total length of the linear magnetization region  60 B 1  is longer than the total length of the linear magnetization region  60 B 2 , the part read by the servo reading element SR and the part that is not read are generated between the linear magnetization region  60 B 1  and the linear magnetization region  60 B 2 . Therefore, in the magnetic tape MT according to the present embodiment, the total length of the linear magnetization region  60 A 1  is shorter than the total length of the linear magnetization region  60 A 2 , and the total length of the linear magnetization region  60 B 1  is longer than the total length of the linear magnetization region  60 B 2 . As a result, the linear magnetization regions  60 A 1  and  60 A 2  can be read by the servo reading element SR and the linear magnetization regions  60 B 1  and  60 B 2  can be read by the servo reading element SR without excess or deficiency (hereinafter, this effect is referred to as “fifth effect”). 
     In addition, in the magnetic tape MT included in the magnetic tape cartridge  12  according to the present embodiment, the linear magnetization region  60 A 1  is a set of five magnetization straight lines  60 A 1   a , and the linear magnetization region  60 A 2  is a set of five magnetization straight lines  60 A 2   a . In addition, the linear magnetization region  60 B 1  is a set of four magnetization straight lines  60 B 1   a , and the linear magnetization region  60 B 2  is a set of four magnetization straight lines  60 B 2   a . Therefore, an amount of information obtained from the servo pattern  58  can be increased as compared with a case in which each linear magnetization region consists of one magnetization straight line, and as a result, highly accurate servo control can be realized (hereinafter, this effect is referred to as “sixth effect”). 
     In addition, in the magnetic tape MT included in the magnetic tape cartridge  12  according to the present embodiment, the geometrical characteristic of the linear magnetization region pair  60 A on the magnetic tape MT corresponds to the geometrical characteristic in which the positions of both ends of the imaginary linear region  62 A and the positions of both ends of the imaginary linear region  62 B are aligned in the width direction WD in a case in which the entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining the symmetry axis SA 1  of the imaginary linear region pair  62  with respect to the imaginary straight line C 1 . Therefore, the variation between the servo pattern signal derived from the linear magnetization region  60 A 1  and the servo pattern signal derived from the linear magnetization region  60 A 2  can be made smaller than in a case in which the servo pattern  52 A having the known geometrical characteristic in the related art is read by the servo reading element SR. As a result, it is possible to obtain the servo pattern signal having higher reliability than the servo pattern signal obtained from the servo pattern  52 A having the known geometrical characteristic in the related art (hereinafter, this effect is referred to as “seventh effect”). 
     It should be noted that the linear magnetization region pair  60 B is different from the linear magnetization region pair  60 A only in that the linear magnetization region  60 B 1  is provided instead of the linear magnetization region  60 A 1 , and the linear magnetization region  60 B 2  is provided instead of the linear magnetization region  60 A 2 . The linear magnetization region pair  60 B configured as described above is also read by the servo reading element SR in the same manner as the linear magnetization region pair  60 A. Therefore, with the present configuration, the variation in the servo pattern signal is smaller than in a case in which the servo pattern  58  is read without considering the information on the inclination of the servo pattern  58 , and as a result, the servo pattern signal having high reliability can be obtained. 
     In addition, the linear magnetization region pair  60 B is different from the linear magnetization region pair  60 A only in that the linear magnetization region  60 B 1  is provided instead of the linear magnetization region  60 A 1 , and the linear magnetization region  60 B 2  is provided instead of the linear magnetization region  60 A 2 . The linear magnetization region pair  60 B configured as described above is also read by the servo reading element SR in the same manner as the linear magnetization region pair  60 A. Therefore, the variation between the servo pattern signal derived from the linear magnetization region  60 B 1  and the servo pattern signal derived from the linear magnetization region  60 B 2  can be made smaller than in a case in which the servo pattern  52 B having the known geometrical characteristic in the related art is read by the servo reading element SR. As a result, it is possible to obtain the servo pattern signal having higher reliability than the servo pattern signal obtained from the servo pattern  52 B having the known geometrical characteristic in the related art (hereinafter, this effect is referred to as “eighth effect”). 
     In addition, the linear magnetization region pair  60 B is read by the servo reading element SR in the same manner as the linear magnetization region pair  60 A. Therefore, the variation between the servo pattern signal derived from the linear magnetization region  60 B 1  and the servo pattern signal derived from the linear magnetization region  60 B 2  can be made smaller than in a case in which the servo pattern  52 B having the known geometrical characteristic in the related art is read by the servo reading element SR. As a result, it is possible to obtain the servo pattern signal having higher reliability than the servo pattern signal obtained from the servo pattern  52 B having the known geometrical characteristic in the related art. 
     In the present embodiment, the servo pattern signal, which is the result of reading the servo pattern  58  by the servo reading element SR, is detected by using the autocorrelation coefficient (see  FIG.  17   ). As a result, the servo pattern signal can be detected with higher accuracy than in a case in which the servo pattern signal is detected by using only a method of determining whether or not the signal level exceeds a threshold value (hereinafter, this effect is referred to as “ninth effect”). 
     The magnetic tape cartridge  12  according to the present embodiment includes the cartridge memory  24 . The servo format information SF is stored in the cartridge memory  24 . Therefore, with the present configuration, the magnetic tape cartridge  12  can have a simpler configuration than in a case in which the magnetic tape cartridge  12  includes a separate unit that stores the servo format information SF. 
     First Modification Example 
     In the first embodiment, the form example has been described in which the controller  30 A performs various controls, such as the servo control, the skew angle control, and/or the tension control based on the position detection result of the servo reading element SR by the position detection unit  30 B. However, the technology of the present disclosure is not limited to this. In a first modification example, a PES calculation unit  30 C calculates the PES from the servo band signal S instead of the position detection of the servo reading element SR by the position detection unit  30 B. Moreover, the controller  30 A performs various controls based on the calculation result of the PES by the PES calculation unit  30 C. 
     First, as described above, the position detection unit  30 B detects a servo pattern signal SP from the servo band signal S by using the autocorrelation coefficient. Moreover, as shown in  FIG.  20    as an example, the position detection unit  30 B outputs the servo pattern signal SP to the PES calculation unit  30 C. Here, the servo pattern signal SP includes a first servo pattern signal SP 1  detected by the first position detection unit  30 B 1  (see  FIG.  16   ) and a second servo pattern signal SP 2  detected by the second position detection unit  30 B 2  (see  FIG.  16   ). 
     The control device  30  includes the PES calculation unit  30 C. The PES calculation unit  30 C calculates the PES based on the servo pattern signal SP acquired from the position detection unit  30 B. For example, the PES calculation unit  30 C calculates a first PES based on the first servo pattern signal SP 1  input from the first position detection unit  30 B 1 . In addition, the PES calculation unit  30 C calculates a second PES based on the second servo pattern signal SP 2  input from the second position detection unit  30 B 2 . 
     The first PES refers to a PES which is a signal indicating an amount of deviation of the servo reading element SR 1  from the original position on the servo band SB 2  along the width direction WD. The second PES refers to a PES which is a signal indicating an amount of deviation of the servo reading element SR 2  from the original position on the servo band SB 3  along the width direction WD. For convenience of description, in a case in which the distinction is not needed, the first PES and the second PES are referred to as “PES”. 
     PES is calculated using Expression (1). 
     
       
         
           
             
               
                 
                   
                     y 
                     ^ 
                   
                   = 
                   
                     
                       d 
                       
                         
                           tan 
                           ⁡ 
                           ( 
                           
                             θ 
                             Ai 
                           
                           ) 
                         
                         - 
                         
                           tan 
                           ⁡ 
                           ( 
                           
                             θ 
                             Bi 
                           
                           ) 
                         
                       
                     
                     ⁢ 
                     
                       ( 
                       
                         
                           1 
                           2 
                         
                         - 
                         
                           
                             A 
                             i 
                           
                           
                             B 
                             i 
                           
                         
                       
                       ) 
                     
                   
                 
               
               
                 
                   ( 
                   1 
                   ) 
                 
               
             
           
         
       
       
         
           
             
               y 
               ^ 
             
             : 
                 
             PES 
           
         
       
       
         
           
             d 
             : 
                
             Picth 
             ⁢ 
                 
             width 
             ⁢ 
                 
             of 
             ⁢ 
                 
             servo 
             ⁢ 
                 
             pattern 
             ⁢ 
                 
             in 
             ⁢ 
                 
             traveling 
             ⁢ 
               
             direction 
           
         
       
       
         
           
             
               A 
               i 
             
             : 
                
             Second 
             ⁢ 
                 
             distance 
           
         
       
       
         
           
             
               B 
               i 
             
             : 
                
             First 
             ⁢ 
                 
             distance 
           
         
       
     
     θ Ai  shown in Expression (1) is an angle of the linear magnetization region  60 A 1  with respect to the imaginary straight line C 1 . In addition, θ Bi  is an angle of the linear magnetization region  60 A 2  with respect to the imaginary straight line C 1  as described above. Here, θ Ai  corresponds to θa shown in  FIG.  11   , and θ Bi  corresponds to θb shown in  FIG.  11   . 
     In Expression (1), a second distance Ai is, for example, a distance calculated from results of reading the magnetization straight line  60 A 1   a  on the most downstream side of the linear magnetization region  60 A 1  in one servo pattern  58 A and the magnetization straight line  60 A 2   a  on the most downstream side in the linear magnetization region  60 A 2  by the servo reading element SR. A first distance Bi is, for example, a distance calculated from results of reading the magnetization straight line  60 A 1   a  on the most downstream side in one servo pattern  58 A of the servo patterns  58  and the magnetization straight line  60 B 1   a  on the most downstream side in the adjacent servo pattern  58 B by the servo reading element SR. 
     The controller  30 A detects the position of the servo reading element SR with respect to the servo band SB based on the PES calculated by the PES calculation unit  30 C. The controller  30 A detects the position of the servo reading element SR 1  with respect to the servo band SB 2  based on the first PES. In addition, the controller  30 A detects the position of the servo reading element SR 2  with respect to the servo band SB 3  based on the second PES. Further, the controller  30 A performs various controls, such as the servo control, the skew angle control, and/or the tension control based on the position detection result of the servo reading element SR with respect to the servo band SB (see  FIG.  17   ). 
     As described above, according to the first modification example, the controller  30 A detects the position of the servo reading element SR with respect to the servo band SB by using the PES calculated by the PES calculation unit  30 C. Further, the controller  30 A performs various controls, such as the servo control, the skew angle control, and/or the tension control based on the position detection result of the servo reading element SR. As a result, the position of the servo reading element SR on the servo band SB is adjusted. Therefore, with the present configuration, the position of the servo reading element SR with respect to the servo pattern  58  is held at the predetermined position determined by design. 
     In addition, according to the first modification example, the PES is calculated based on Expression (1). Expression (1) is an expression in consideration of the inclination of the servo pattern  58 . Therefore, by using Expression (1), it is possible to calculate the PES in consideration of the inclination of the servo pattern  58 . As a result, various controls are performed based on the result of calculating the PES using the expression in consideration of the inclination of the servo pattern  58 . Therefore, with the present configuration, the position of the servo reading element SR with respect to the servo pattern  58  is held at the predetermined position determined by design. 
     Second Modification Example 
     In the first embodiment, the form example has been described in which the servo format information SF includes the servo pattern inclination information SF 1 , but the technology of the present disclosure is not limited to this. In a second modification example, the servo format information SF includes information on the width of the magnetic tape MT (hereinafter, also referred to as magnetic tape width change information SF 2 ) and information on the geometrical characteristic of the servo pattern  58  (hereinafter, also referred to as servo pattern geometrical characteristic information SF 3 ). The magnetic tape width change information SF 2  is, for example, information indicating a width change in the total length direction of the magnetic tape MT (that is, a degree of temporal width change). The servo pattern geometrical characteristic information SF 3  is, for example, information indicating the length, the shape, the orientation, and the position of the servo pattern  58 . The magnetic tape width change information SF 2  is an example of “information on the width of the magnetic tape” according to the technology of the present disclosure, and the servo pattern geometrical characteristic information SF 3  is an example of “information on the geometrical characteristic of the magnetic tape” according to the technology of the present disclosure. 
     As an example, as shown in  FIG.  21   , the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3  are stored in the cartridge memory  24 . The control device  30  acquires the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3  from the cartridge memory  24  via the noncontact read/write device  46 . The control device  30  operates the inclination mechanism  49  based on the magnetic tape width change information SF 2 . As a result, the magnetic head skew angle is adjusted. For example, the inclination mechanism  49  makes the magnetic head skew angle larger than the inclined angle α of the servo pattern  58  indicated by the servo pattern inclination information SF 1  in a region in which the width of the magnetic tape MT is narrowed in the total length direction of the magnetic tape MT. On the other hand, the inclination mechanism  49  makes the magnetic head skew angle smaller than the inclined angle α of the servo pattern  58  indicated by the servo pattern inclination information SF 1  in a region in which the width of the magnetic tape MT is widened. 
     In addition, the control device  30  operates the inclination mechanism  49  based on the servo pattern geometrical characteristic information SF 3 . As a result, the magnetic head skew angle is adjusted. For example, the inclination mechanism  49  adjusts the magnetic head skew angle in accordance with partial misregistration of the servo pattern  58  indicated by the servo pattern geometrical characteristic information SF 3  in the total length direction of the magnetic tape MT (for example, misregistration in the width direction WD) or the change in the orientation. 
     As described above, according to the second modification example, the servo format information SF includes the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3 . Moreover, the control device  30  acquires the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3  from the cartridge memory  24 . The control device  30  controls the operation of the inclination mechanism  49  based on the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3 . As a result, the magnetic head skew angle is adjusted. Therefore, with the present configuration, the servo pattern signal having higher reliability can be obtained than in a case in which the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3  are not taken into consideration. 
     It should be noted that, as the second modification example, the example has been described in which the servo format information SF includes the magnetic tape width change information SF 2  and the servo pattern geometrical characteristic information SF 3 , but this is merely an example. A form may be adopted in which the servo format information SF includes any one of the magnetic tape width change information SF 2  or the servo pattern geometrical characteristic information SF 3 . 
     In addition, as the second modification example, the example has been described in which the servo pattern geometrical characteristic information SF 3  includes the information indicating the length, the shape, the orientation, and the position of the servo pattern  58 , but this is merely an example. Any one or two or more of the information indicating the length, the shape, the orientation, or the position of the servo pattern  58  may be used as the servo pattern geometrical characteristic information SF 3 . 
     Third Modification Example 
     In the first embodiment, the form has been described in which the servo format information SF includes the servo pattern inclination information SF 1  which is the information on the inclination of the servo pattern  58 , but the technology of the present disclosure is not limited to this. In a third modification example, as shown in  FIG.  22    as an example, the servo format information SF includes information SF 4  for adjusting the width of the magnetic tape (hereinafter, also referred to as “width adjustment information SF 4 ”). The width adjustment information SF 4  is information for adjusting a width W of the magnetic tape MT (that is, a distance of the magnetic tape MT along the width direction WD, hereinafter, also simply referred to as “tape width W”) (that is, information used to adjust the tape width W). It should be noted that the width adjustment information SF 4  is an example of “width adjustment information” according to the technology of the present disclosure. 
     As described above, the magnetic tape MT expands and contracts in the width direction WD due to the pressure, temperature, humidity, temporal deterioration, and the like of being wound around the cartridge reel (not shown). As a result, the inclined angle α of the servo pattern  58  may also be changed. Therefore, even in a case in which the magnetic head skew angle is adjusted based on the servo pattern inclination information SF 1  included in the servo format information SF, the inclined angle α of the servo pattern  58  and the magnetic head skew angle may not close to each other (that is, the magnetic head skew angle is outside the allowable range). As a result, there is a risk that the reliability of the servo pattern signal is reduced. 
     Therefore, the servo format information SF according to the third modification example includes the width adjustment information SF 4 . The width adjustment information SF 4  is stored in the cartridge memory  24 . The width adjustment information SF 4  includes tension information SF 4   a , for example, as shown in  FIG.  23   . The tension information SF 4   a  refers to information on the tension in the total length direction of the magnetic tape MT. Examples of the tension information SF 4   a  include information indicating the tension generated in the magnetic tape MT at a stage in which the servo pattern  58  is recorded in the magnetic tape MT, but this is merely an example. The tension information SF 4   a  may be information indicating, for example, the tension generated in the magnetic tape MT in a case in which the magnetic tape MT has been used in the past (for example, at a time designated from the use history of the magnetic tape MT). The tension information SF 4   a  is an example of “information on the tension in the total length direction of the magnetic tape” according to the technology of the present disclosure. 
     As an example, as shown in  FIG.  22   , the control device  30  acquires the width adjustment information SF 4  from the cartridge memory  24  via the noncontact read/write device  46 . The control device  30  performs the tension control based on the width adjustment information SF 4 . The tension control is realized by adjusting the rotation speed, and/or rotation torque of each of the sending motor  36  and the winding motor  40 . For example, the control device  30  increases the tension applied to the magnetic tape MT in a case in which the magnetic tape MT expands in the width direction WD. In addition, the control device  30  weakens the tension applied to the magnetic tape MT in a case in which the magnetic tape MT contracts in the width direction WD. As a result, the width W of the magnetic tape MT is adjusted. 
     As described above, according to the third modification example, the servo format information SF includes the width adjustment information SF 4  which is the information for adjusting the tape width W. The width adjustment information SF 4  is stored in the cartridge memory  24 . The control device  30  acquires the width adjustment information SF 4  from the cartridge memory  24 . Moreover, the control device  30  performs the tension control based on the width adjustment information SF 4  acquired from the cartridge memory  24 . As a result, the width W of the magnetic tape MT is adjusted, so that even in a case in which the width W of the magnetic tape MT expands and contracts, the inclined angle α of the servo pattern  58  and the magnetic head skew angle are close to each other. 
     It should be noted that, in the third modification example, the form example has been described in which the information on the tension generated in the magnetic tape MT at the stage in which the servo pattern  58  has been recorded in the magnetic tape MT and at the stage in which the magnetic tape MT has been used in the past is used as the tension information SF 4   a , but the technology of the present disclosure is not limited to this. For example, the tension information SF 4   a  is determined based on various factors that influence the tension of the magnetic tape MT. 
     As shown in  FIG.  24    as an example, tension influence factor information TF is stored in the cartridge memory  24 . The tension influence factor information TF refers to information indicating a factor that influences the tension generated in the magnetic tape MT. The tension influence factor information TF includes magnetic tape width information TF 1 , magnetic tape characteristic information TF 2 , use history information TF 3 , temperature information TF 4 , and humidity information TF 5 . The magnetic tape width information TF 1  refers to information indicating the width W of the magnetic tape MT. The magnetic tape characteristic information TF 2  refers to information indicating the characteristic (for example, expansion coefficient and/or material) of the magnetic tape MT itself. The use history information TF 3  refers to information indicating the use history (for example, a use time and/or the number of times of use) of the magnetic tape MT. The temperature information TF 4  refers to information indicating the temperature given to the magnetic tape MT (for example, an average temperature in the case  16  in a case in which the magnetic tape cartridge  12  is stored). The humidity information TF 5  refers to information indicating the humidity given to the magnetic tape MT (for example, average humidity in the case  16  in a case in which the magnetic tape cartridge  12  is stored). 
     The control device  30  acquires the tension influence factor information TF from the cartridge memory  24  via the noncontact read/write device  46 . The control device  30  determines the tension information SF 4   a  in the total length direction of the magnetic tape MT based on the tension influence factor information TF. For example, the control device  30  may calculate the tension using a tension arithmetic expression or a tension table. The tension arithmetic expression refers to, for example, an arithmetic expression in which the magnetic tape width information TF 1 , the magnetic tape characteristic information TF 2 , the use history information TF 3 , the temperature information TF 4 , and the humidity information TF 5  are used as dependent variables, and the information indicating the tension in the total length direction of the magnetic tape MT is used as an independent variable. In addition, the tension table refers to a table in which the magnetic tape width information TF 1 , the magnetic tape characteristic information TF 2 , the use history information TF 3 , the temperature information TF 4 , and the humidity information TF 5  are used as input values, and the information indicating the tension in the total length direction of the magnetic tape MT is used as an output value. The control device  30  performs the tension control based on the tension information SF 4   a.    
     As described above, in the third modification example, the control device  30  determines the tension information SF 4   a  based on the tension influence factor information TF acquired from the cartridge memory  24 . Moreover, the control device  30  performs the tension control based on the tension information SF 4   a . As a result, the width W of the magnetic tape MT is adjusted, so that even in a case in which the width W of the magnetic tape MT expands and contracts, the inclined angle α of the servo pattern  58  and the magnetic head skew angle can be close to each other. 
     It should be noted that the example has been described in which the magnetic tape width information TF 1 , the magnetic tape characteristic information TF 2 , the use history information TF 3 , the temperature information TF 4 , and the humidity information TF 5  are used as the tension influence factor information TF, but this is merely an example. For example, any one or two or more of the magnetic tape width information TF 1 , the magnetic tape characteristic information TF 2 , the use history information TF 3 , the temperature information TF 4 , or the humidity information TF 5  may be combined and used as the tension influence factor information TF. 
     Fourth Modification Example 
     In the first embodiment, the form has been described in which the servo format information SF includes the servo pattern inclination information SF 1  which is the information on the inclination of the servo pattern  58 , but the technology of the present disclosure is not limited to this. In a fourth modification example, as shown in  FIG.  25    as an example, the servo format information SF includes skew angle information SF 5 . The skew angle information SF 5  refers to information on the skew angle of the magnetic head  28 . The skew angle information SF 5  is an example of “information on the skew angle” according to the technology of the present disclosure. 
     By the way, even in a case in which the magnetic tape MT has the same manufacturing conditions, the inclined angle α of the servo pattern  58  may differ due to individual differences in the servo pattern recording head WH. In addition, as described above, the inclined angle α of the servo pattern  58  may be changed due to the expansion and contraction of the magnetic tape MT in the width direction. Therefore, even in a case in which the magnetic head skew angle is adjusted based on the servo pattern inclination information SF 1  included in the servo format information SF, the inclined angle α of the servo pattern  58  and the magnetic head skew angle may not close to each other. As a result, there is a risk that the reliability of the servo pattern signal is reduced. 
     Therefore, the servo format information SF according to the fourth modification example includes the skew angle information SF 5 . The skew angle information SF 5  is stored in the cartridge memory  24 . The skew angle information SF 5  is information indicating an angle difference (hereinafter, also simply referred to as “skew angle difference”) the inclined angle α of the servo pattern  58  determined based on the servo pattern inclination information SF 1  and the inclined angle α of the servo pattern  58  changed due to various influences. Examples of the skew angle information SF 5  include the information indicating the skew angle difference in accordance with the individual number of the servo pattern recording head WH, but this is merely an example. For example, the skew angle information SF 5  may be the information indicating the skew angle difference in accordance with a degree of expansion and contraction of the magnetic tape MT in the width direction. 
     The control device  30  acquires the skew angle information SF 5  from the cartridge memory  24  via the noncontact read/write device  46 . The control device  30  performs the skew angle control based on the skew angle information SF 5 . For example, the inclination mechanism  49  changes the magnetic head skew angle by the angle difference obtained based on the skew angle information SF 5 . That is, the inclination mechanism  49  adjusts the angle formed by the imaginary straight line C 1  and the imaginary straight line C 3  from the angle γ (see  FIG.  15   ) to an adjusted angle γ 1 . As a result, the inclined angle α of the servo pattern  58  and the magnetic head skew angle are close to each other. 
     As described above, according to the fourth modification example, the servo format information SF includes the skew angle information SF 5 . The control device  30  acquires the skew angle information SF 5  from the cartridge memory  24 . Moreover, the control device  30  controls the skew angle of the magnetic head  28  based on the skew angle information SF 5  acquired from the cartridge memory  24 . As a result, the inclined angle α of the servo pattern  58  and the magnetic head skew angle are close to each other. 
     It should be noted that, in the fourth modification example, the form example has been described in which the information indicating the skew angle difference in accordance with the individual number of the servo pattern recording head WH is used as the skew angle information SF 5 , but the technology of the present disclosure is not limited to this. For example, the skew angle information SF 5  is determined based on various factors that influence the inclined angle α of the servo pattern  58 . In the example shown in  FIG.  26   , information on the factor that influences the inclined angle α of the servo pattern  58  (hereinafter, also simply referred to as “angle influence factor information DF”) is stored in the cartridge memory  24 . 
     The angle influence factor information DF includes magnetic tape width information DF 1 , magnetic tape characteristic information DF 2 , use history information DF 3 , temperature information DF 4 , and humidity information DF 5 . The magnetic tape width information DF 1  refers to the information indicating the width W (see  FIG.  22   ) of the magnetic tape MT. The magnetic tape characteristic information DF 2  refers to the information indicating the characteristic (for example, expansion coefficient and/or material) of the magnetic tape MT itself. The use history information DF 3  refers to the information indicating the use history (for example, the use time and/or the number of times of use) of the magnetic tape MT. The temperature information DF 4  refers to the information indicating the temperature given to the magnetic tape MT (for example, the average temperature in the case  16  in a case in which the magnetic tape cartridge  12  is stored). The humidity information DF 5  refers to the information indicating the humidity given to the magnetic tape MT (for example, the average humidity in the case  16  in a case in which the magnetic tape cartridge  12  is stored). 
     The control device  30  acquires the angle influence factor information DF from the cartridge memory  24  via the noncontact read/write device  46 . The control device  30  determines the skew angle information SF 5  in accordance with the angle influence factor information DF. For example, the control device  30  may derive the angle difference by using an angle difference arithmetic expression or an angle difference table. The angle difference arithmetic expression is, for example, an arithmetic expression in which the magnetic tape width information DF 1 , the magnetic tape characteristic information DF 2 , the use history information DF 3 , the temperature information DF 4 , and the humidity information DF 5  are used as dependent variables, and the skew angle information SF 5  is used as an independent variable. The tension table refers to a table in which the magnetic tape width information DF 1 , the magnetic tape characteristic information DF 2 , the use history information DF 3 , the temperature information DF 4 , and the humidity information DF 5  are input values, and the skew angle information SF 5  is an output value. The control device  30  determines the skew angle information SF 5  in accordance with the angle influence factor information DF. The control device  30  controls the skew angle of the magnetic head  28  based on the skew angle information SF 5 . 
     As described above, in the fourth modification example, the control device  30  determines the skew angle information SF 5  in accordance with the angle influence factor information DF acquired from the cartridge memory  24 . Moreover, the control device  30  performs the skew angle control based on the skew angle information SF 5 . As a result, the inclined angle α of the servo pattern  58  and the magnetic head skew angle are close to each other. 
     It should be noted that the example has been described in which the magnetic tape width information DF 1 , the magnetic tape characteristic information DF 2 , the use history information DF 3 , the temperature information DF 4 , and the humidity information DF 5  are used as the angle influence factor information DF, but this is merely an example. For example, any one or two or more of the magnetic tape width information DF 1 , the magnetic tape characteristic information DF 2 , the use history information DF 3 , the temperature information DF 4 , and the humidity information DF 5  may be combined and used as the angle influence factor information DF. 
     Fifth Modification Example 
     In the embodiment described above, the servo format information SF includes the servo pattern inclination information SF 1 , but the technology of the present disclosure is not limited to this. In a fifth modification example, the servo format information SF includes an ideal waveform signal  67  indicating the ideal waveform of the servo pattern signal which is the result of reading the servo pattern  58  by the servo reading element SR. 
     As described above, in a case in which there is a large deviation between the inclined angle α of the servo pattern  58  and the magnetic head skew angle (for example, the inclined angle α of the servo pattern  58  is 5 degrees and the magnetic head skew angle is 10 degrees), the variation due to the azimuth loss may occur between the servo pattern signals (see  FIG.  13   ). Such a variation in the servo pattern signal can contribute to a decrease in the accuracy of the servo control. 
     Here, as described above, the variation in the servo pattern signal due to the azimuth loss (for example, the variation in the signal level and the waveform distortion) is due to the difference between the inclined angle α of the servo pattern  58  and the magnetic head skew angle. Stated another way, the variation in the servo pattern signal reflects the difference between the inclined angle α and the magnetic head skew angle of the servo pattern  58 . 
     Therefore, in the fifth modification example, the servo format information SF includes the ideal waveform signal  67  indicating the ideal waveform of the servo pattern signal in accordance with the inclined angle α of the servo pattern  58 . In addition, the controller  30 A calculates the inclined angle α of the servo pattern  58 . 
     As an example, as shown in  FIG.  27   , the control device  30  includes an angle detection unit  30 D. The angle detection unit  30 D acquires the servo band signal S, which is the result of reading the servo band SB by the servo reading element SR, and detects the angle of the servo reading element SR with respect to the servo band SB on the magnetic tape MT based on the acquired servo band signal S. The angle detection unit  30 D includes a first angle detection unit  30 D 1  and a second angle detection unit  30 D 2 . 
     The first angle detection unit  30 D 1  acquires the first servo band signal S 1 , and the second angle detection unit  30 D 2  acquires the second servo band signal S 2 . In the example shown in  FIG.  27   , the first angle detection unit  30 D 1  acquires the first servo band signal S 1  obtained by reading the servo pattern  58  in the servo band SB 2  by the servo reading element SR 1 . The second angle detection unit  30 D 2  acquires the second servo band signal S 2  obtained by reading the servo pattern  58  in the servo band SB 3  by the servo reading element SR 2 . The first angle detection unit  30 D 1  detects the angle of the servo reading element SR 1  with respect to the servo band SB 2  based on the first servo band signal S 1 , and the second angle detection unit  30 D 2  detects the angle of the servo reading element SR 2  with respect to the servo band SB 3  based on the second servo band signal S 2 . 
     As an example, as shown in  FIG.  28   , the angle detection unit  30 D calculates the inclined angle α of the servo pattern  58  by using the ideal waveform signal and the autocorrelation coefficient from the servo pattern signal which is the result of reading the servo pattern  58  by the servo reading element SR from the magnetic tape MT. 
     Next, a specific configuration example of the first angle detection unit  30 D 1  will be described. It should be noted that since a configuration of the second angle detection unit  30 D 2  is the same as a configuration of the first angle detection unit  30 D 1 , the description of a specific configuration example of the second angle detection unit  30 D 2  will be omitted. In addition, in the following, for convenience of description, the servo pattern signal derived from the linear magnetization region  60 A 1  or  60 B 1  (see  FIGS.  9  and  10   ) is also referred to as a “first linear magnetization region signal”, and the servo pattern signal derived from the linear magnetization region  60 A 2  or  60 B 2  (see  FIGS.  9  and  10   ) is also referred to as a “second linear magnetization region signal”. 
     As an example, as shown in  FIG.  28   , the first angle detection unit  30 D 1  includes a first detection circuit  39 A and a second detection circuit  39 B. The first detection circuit  39 A and the second detection circuit  39 B are connected in parallel and comprise an input terminal  30 B 1   a  and an output terminal  30 B 1   b  common to each other. In the example shown in  FIG.  28   , an aspect example is shown in which the first servo band signal S 1  is input to the input terminal  30 B 1   a . The first servo band signal S 1  includes a first linear magnetization region signal S 1   a  and a second linear magnetization region signal S 1   b . The first linear magnetization region signal S 1   a  and the second linear magnetization region signal S 1   b  are the servo pattern signals (that is, analog servo pattern signals) which are the results of being read by the servo reading element SR 1  (see  FIG.  27   ). That is, the servo pattern signal includes the first linear magnetization region signal S 1   a  and the second linear magnetization region signal S 1   b.    
     The cartridge memory  24  stores the ideal waveform signal  67  in accordance with the inclined angle α of the servo pattern  58 . That is, the servo format information SF stored in the cartridge memory  24  includes the ideal waveform signal  67 . The ideal waveform signal  67  is a signal indicating a single ideal waveform included in the servo band signal S in accordance with the inclined angle α of the servo pattern  58  (for example, ideal signal which is a result of reading one ideal magnetization straight line included in the servo pattern  58  inclined with respect to the imaginary straight line C 1  at a predetermined angle by the servo reading element SR). The ideal waveform signal  67  can be said to be a sample signal in accordance with the inclined angle α of the servo pattern  58  to be compared with the servo band signal S. It should be noted that the ideal waveform signal  67  is an example of an “ideal waveform signal” according to the technology of the present disclosure. 
     An ideal waveform indicated by a first ideal waveform signal  67 A is a waveform determined in accordance with the orientation of the magnetic head  28  on the magnetic tape MT. A relative positional relationship between the holder  44  (see  FIG.  8   ) of the magnetic head  28  and the servo reading element SR is fixed. Therefore, the ideal waveform indicated by the first ideal waveform signal  67 A can be said to be a waveform determined in accordance with the orientation of the servo reading element SR on the magnetic tape MT. Stated another way, the ideal waveform indicated by the first ideal waveform signal  67 A is a waveform in accordance with the inclined angle α of the servo pattern  58 . For example, the ideal waveform indicated by the first ideal waveform signal  67 A is a waveform determined in accordance with the inclined angle θa of the linear magnetization region  60 A 1  of the servo pattern  58 . 
     As described above, since the relative positional relationship between the holder  44  (see  FIG.  8   ) of the magnetic head  28  and the servo reading element SR is fixed, the ideal waveform indicated by the first ideal waveform signal  67 A can be said to be a waveform determined in accordance with the geometrical characteristic of the linear magnetization region pair  60 A of the servo pattern  58  (for example, geometrical characteristic of the magnetization straight line  60 A 1   a ) and the orientation of the servo reading element SR on the magnetic tape MT. Here, the orientation of the magnetic head  28  on the magnetic tape MT refers to, for example, an angle formed by the linear magnetization region  60 A 1  and the magnetic head  28  on the magnetic tape MT. In addition, the orientation of the servo reading element SR on the magnetic tape MT refers to, for example, an angle formed by the linear magnetization region  60 A 1  and the servo reading element SR on the magnetic tape MT. 
     Similarly to the ideal waveform indicated by the first ideal waveform signal  67 A, an ideal waveform indicated by a second ideal waveform signal  67 B is also a waveform determined in accordance with the orientation of the magnetic head  28  on the magnetic tape MT, that is, a waveform determined in accordance with the orientation of the servo reading element SR on the magnetic tape MT. Stated another way, the ideal waveform indicated by the second ideal waveform signal  67 B is a waveform in accordance with the inclined angle α of the servo pattern  58 . For example, the ideal waveform indicated by the second ideal waveform signal  67 B is a waveform determined in accordance with the inclined angle θb of the linear magnetization region  60 A 2  of the servo pattern  58 . 
     For example, the ideal waveform indicated by the second ideal waveform signal  67 B is a waveform determined in accordance with the geometrical characteristic of the linear magnetization region  60 A 2  of the servo pattern  58 A (for example, geometrical characteristic of the magnetization straight line  60 A 2   a ) and the orientation of the magnetic head  28  on the magnetic tape MT, that is, a waveform determined in accordance with the geometrical characteristic of the linear magnetization region  60 A 2  of the servo pattern  58 A (for example, geometrical characteristic of the magnetization straight line  60 A 2   a ) and the orientation of the servo reading element SR on the magnetic tape MT. Here, the orientation of the magnetic head  28  on the magnetic tape MT refers to, for example, an angle formed by the linear magnetization region  60 A 2  and the magnetic head  28  on the magnetic tape MT. In addition, the orientation of the servo reading element SR on the magnetic tape MT refers to, for example, an angle formed by the linear magnetization region  60 A 2  and the servo reading element SR on the magnetic tape MT. 
     The first angle detection unit  30 D 1  calculates an angle formed by the linear magnetization region  60 A 1  in the servo band SB 3  and the servo reading element SR by comparing the first servo band signal S 1  with the ideal waveform signal  67 . In the example shown in  FIG.  28   , the first angle detection unit  30 D 1  detects the inclined angle α of the servo pattern  58  by using the first detection circuit  39 A and the second detection circuit  39 B. 
     The first servo band signal S 1  is input to the first detection circuit  39 A via the input terminal  30 B 1   a . The first detection circuit  39 A detects the inclined angle θa of the linear magnetization region  60 A 1  in the servo pattern  58  of the servo band SB 3  from the input first servo band signal S 1  by using the autocorrelation coefficient. 
     The autocorrelation coefficient used by the first detection circuit  39 A is a coefficient indicating a degree of correlation between the first servo band signal S 1  and the first ideal waveform signal  67 A. The first detection circuit  39 A acquires the first ideal waveform signal  67 A from the cartridge memory  24  to compare the acquired first ideal waveform signal  67 A with the first servo band signal S 1 . Moreover, the first detection circuit  39 A calculates the autocorrelation coefficient based on the comparison result. The first detection circuit  39 A detects an ideal waveform signal having the highest correlation with the first servo band signal S 1  on the servo band SB 2  in accordance with the autocorrelation coefficient. The first detection circuit  39 A outputs the inclined angle θa of the linear magnetization region  60 A 1  corresponding to the detected ideal waveform signal. 
     On the other hand, the first servo band signal S 1  is also input to the second detection circuit  39 B via the input terminal  30 B 1   a . The second detection circuit  39 B detects the inclined angle θb of the linear magnetization region  60 A 2  in the servo pattern  58  of the servo band SB 2  from the input first servo band signal S 1  by using the autocorrelation coefficient. 
     The autocorrelation coefficient used by the second detection circuit  39 B is a coefficient indicating a degree of correlation between the first servo band signal S 1  and the second ideal waveform signal  67 B. The second detection circuit  39 B acquires the second ideal waveform signal  67 B from the storage  32  to compare the acquired second ideal waveform signal  67 B with the first servo band signal S 1 . Moreover, the second detection circuit  39 B calculates the autocorrelation coefficient based on the comparison result. The second detection circuit  39 B detects an ideal waveform signal having the highest correlation with the first servo band signal S 1  on the servo band SB 2  in accordance with the autocorrelation coefficient. The second detection circuit  39 B outputs the inclined angle θb of the linear magnetization region  60 A 2  corresponding to the detected ideal waveform signal. 
     As an example, as shown in  FIG.  29   , the first angle detection unit  30 D 1  detects the inclined angle θa of the linear magnetization region  60 A 1  and the inclined angle θb of the linear magnetization region  60 A 2  based on the detection result by the first detection circuit  39 A and the detection result by the second detection circuit  39 B. 
     The inclined angle α of the servo pattern  58  is output from the output terminal  30 B 1   b  to the controller  30 A. In addition, the control device  30  includes the PES calculation unit  30 C. The PES calculation unit  30 C calculates the PES by using the inclined angle θa of the linear magnetization region  60 A 1  and the inclined angle θb of the linear magnetization region  60 A 2  acquired from the angle detection unit  30 D, and Expression (1). That is, in Expression (1), the inclined angle θa of the linear magnetization region  60 A 1  is used as θ Ai , and the inclined angle θb of the linear magnetization region  60 A 2  is used as θ Bi . 
     As an example, as shown in  FIG.  29   , the controller  30 A adjusts the skew angle of the magnetic head  28  by operating the inclination mechanism  49  (see  FIG.  14   ) based on the calculation result of the PES by the PES calculation unit  30 C. In addition, the controller  30 A causes the magnetic element unit  42  (see  FIG.  17   ) to perform the magnetic processing on the data band DB of the magnetic tape MT. That is, the controller  30 A acquires a read signal (that is, data read from the data band DB of the magnetic tape MT by the magnetic element unit  42 ) from the magnetic element unit  42 , or supplies a recording signal to the magnetic element unit  42  to record the data in response to the recording signal in the data band DB of the magnetic tape MT. 
     In addition, in order to reduce the influence of the TDS, the controller  30 A performs the tension control or skews the magnetic head  28  (see  FIG.  14   ) on the magnetic tape MT in accordance with the angle detection result of the angle detection unit  30 D. The tension control is realized by adjusting the rotation speed, rotation torque, and the like of each of the sending motor  36  (see  FIG.  3   ) and the winding motor  40  (see  FIG.  3   ). The skew of the magnetic head  28  is realized by operating the inclination mechanism  49  (see  FIG.  14   ). 
     As described above, in the fifth modification example, as the ideal waveform indicated by the ideal waveform signal  67 , a waveform determined in accordance with the orientation of the magnetic head  28  on the magnetic tape MT, that is, the orientation of the inclination mechanism  49  on the magnetic tape MT is used. Therefore, with the present configuration, it is possible to detect the servo pattern signal from the servo band signal S with higher accuracy than in a case in which the ideal waveform is determined regardless of the orientation of the magnetic head  28  on the magnetic tape MT, that is, the orientation of the servo reading element SR on the magnetic tape MT. 
     In the fifth modification example, as the ideal waveform indicated by the ideal waveform signal  67 , the waveform determined in accordance with the geometrical characteristic of the servo pattern  58  and the orientation of the magnetic head  28  on the magnetic tape MT, that is, the geometrical characteristic of the servo pattern  58  and the orientation of the servo reading element SR on the magnetic tape MT is used. Therefore, with the present configuration, it is possible to detect the servo pattern signal from the servo band signal S with higher accuracy than in a case in which the ideal waveform is determined regardless of the geometrical characteristic of the servo pattern  58  and the orientation of the magnetic head  28  on the magnetic tape MT, that is, the geometrical characteristic of the servo pattern  58  and the orientation of the servo reading element SR on the magnetic tape MT. 
     In addition, in the fifth modification example, the linear magnetization regions  60 A 1  and  60 A 2  inclined in opposite directions with respect to the imaginary straight line C 1  are read by the servo reading element SR. In this case, as described above, there is the variation due to the azimuth loss between the first linear magnetization region signal S 1   a  (see  FIG.  28   ) and the second linear magnetization region signal S 1   b  (see  FIG.  28   ). In the fifth modification example, the ideal waveform signal  67  is stored in the cartridge memory  24 , and the inclined angle α of the servo pattern  58  is detected by comparing the servo pattern signal with the ideal waveform signal  67 . Therefore, with the present configuration, even in a case in which the linear magnetization regions  60 A 1  and  60 A 2  inclined in opposite directions with respect to the imaginary straight line C 1  are read by the servo reading element SR, it is possible to detect the inclined angle α of the servo pattern  58  with higher accuracy than in a case in which the inclined angle α of the servo pattern  58  is detected by using only the method of determining whether or not the signal level exceeds the threshold value. 
     In addition, in the fifth modification example, the first detection circuit  39 A and the second detection circuit  39 B are connected in parallel, and the common servo band signal S is incorporated into the first detection circuit  39 A and the second detection circuit  39 B. Moreover, the inclined angle θa of the linear magnetization region  60 A 1  is detected by comparing the servo band signal S with the first ideal waveform signal  67 A by the first detection circuit  39 A, and the inclined angle θb of the linear magnetization region  60 A 2  is detected by comparing the servo band signal S with the second ideal waveform signal  67 B by the second detection circuit  39 B. For example, the first position detection unit  30 B 1  detects the inclined angle θa of the linear magnetization region  60 A 1  detected by the first detection circuit  39 A and the inclined angle θb of the linear magnetization region  60 A 2  detected by the second detection circuit  39 B. In addition, the second position detection unit  30 B 2  detects the inclined angle θa of the linear magnetization region  60 A 1  detected by the first detection circuit  39 A and the inclined angle θb of the linear magnetization region  60 A 2  detected by the second detection circuit  39 B. Therefore, with the present configuration, it is possible to detect the inclined angle α of the servo pattern  58  more quickly than in a case in which the inclined angle θa of the linear magnetization region  60 A 1  and the inclined angle θb of the linear magnetization region  60 A 2  are detected in order by sequentially comparing different ideal waveform signals with respect to one servo band signal S. 
     Sixth Modification Example 
     In the embodiment described above, the form example has been described in which the plurality of V-shaped servo patterns  58  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT, but the technology of the present disclosure is not limited to this. For example, as shown in  FIG.  30   , a servo pattern  72  may be an M-shaped magnetized servo pattern. A plurality of servo patterns  72  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. The plurality of servo patterns  72  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT, similarly to the plurality of servo patterns  58 . 
     In the example shown in  FIG.  30   , servo patterns  72 A and  72 B are shown as an example of the set of servo patterns  72 . Each of the servo patterns  72 A and  72 B is an M-shaped magnetized servo pattern. The servo patterns  72 A and  72 B are adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The servo pattern  72 A is positioned on the upstream side in the forward direction, and the servo pattern  72 B is positioned on the downstream side in the forward direction. 
     As an example, as shown in  FIG.  31   , the servo pattern  72  consists of a linear magnetization region pair  74 . The linear magnetization region pair  74  is classified into a linear magnetization region pair  74 A and a linear magnetization region pair  74 B. The servo pattern  72 A consists of a set of linear magnetization region pairs  74 A. The set of linear magnetization region pairs  74 A are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. 
     In the example shown in  FIG.  31   , linear magnetization regions  74 A 1  and  74 A 2  are shown as an example of the linear magnetization region pair  74 A. The linear magnetization region pair  74 A is configured in the same manner as the linear magnetization region pair  60 A described in the above embodiment, and has the same geometrical characteristic as the linear magnetization region pair  60 A. That is, the linear magnetization region  74 A 1  is configured in the same manner as the linear magnetization region  60 A 1  described in the above embodiment, and has the same geometrical characteristic as the linear magnetization region  60 A 1 , and the linear magnetization region  74 A 2  is configured in the same manner as the linear magnetization region  60 A 2  described in the above embodiment, and has the same geometrical characteristic as the linear magnetization region  60 A 2 . 
     In the example shown in  FIG.  31   , the linear magnetization region pair  74 A is an example of a “linear magnetization region pair” according to the technology of the present disclosure, the linear magnetization region  74 A 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  74 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     The servo pattern  72 B consists of a set of linear magnetization region pairs  74 B. The set of linear magnetization region pairs  74 B are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. 
     In the example shown in  FIG.  31   , linear magnetization regions  74 B 1  and  74 B 2  are shown as an example of the linear magnetization region pair  74 B. The linear magnetization region pair  74 B is configured in the same manner as the linear magnetization region pair  60 B described in the above embodiment, and has the same geometrical characteristic as the linear magnetization region pair  60 B. That is, the linear magnetization region  74 B 1  is configured in the same manner as the linear magnetization region  60 B 1  described in the above embodiment, and has the same geometrical characteristic as the linear magnetization region  60 B 1 , and the linear magnetization region  74 B 2  is configured in the same manner as the linear magnetization region  60 B 2  described in the above embodiment, and has the same geometrical characteristic as the linear magnetization region  60 B 2 . 
     In the example shown in  FIG.  31   , the linear magnetization region pair  74 B is an example of a “linear magnetization region pair” according to the technology of the present disclosure, the linear magnetization region  74 B 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  74 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     Seventh Modification Example 
     In the example shown in  FIG.  32   , the form example has been described in which the plurality of M-shaped servo patterns  58  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT, but the technology of the present disclosure is not limited to this. For example, as shown in  FIG.  33   , the servo pattern  72  may be an N-shaped magnetized servo pattern. A plurality of servo patterns  78  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. Similarly to the plurality of servo patterns  72  (see  FIG.  30   ), the plurality of servo patterns  78  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT. 
     In the example shown in  FIG.  32   , servo patterns  78 A and  78 B are shown as an example of the set of servo patterns  78 . Each of the servo patterns  78 A and  78 B is an N-shaped magnetized servo pattern. The servo patterns  78 A and  78 B are adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The servo pattern  78 A is positioned on the upstream side in the forward direction, and the servo pattern  78 B is positioned on the downstream side in the forward direction. 
     As an example, as shown in  FIG.  33   , the servo pattern  78  consists of a linear magnetization region group  80 . The linear magnetization region group  80  is classified into a linear magnetization region group  80 A and a linear magnetization region group  80 B. 
     The servo pattern  78 A consists of the linear magnetization region group  80 A. The linear magnetization region group  80 A consists of linear magnetization regions  80 A 1 ,  80 A 2 , and  80 A 3 . The linear magnetization regions  80 A 1 ,  80 A 2 , and  80 A 3  are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The linear magnetization regions  80 A 1 ,  80 A 2 , and  80 A 3  are disposed in the order of the linear magnetization regions  80 A 1 ,  80 A 2 , and  80 A 3  from the upstream side in the forward direction. 
     The linear magnetization regions  80 A 1  and  80 A 2  are configured in the same manner as the linear magnetization region pair  74 A shown in  FIG.  31   , and have the same geometrical characteristics as the linear magnetization region pair  74 A. That is, the linear magnetization region  80 A 1  is configured in the same manner as the linear magnetization region  74 A 1  shown in  FIG.  31   , and has the same geometrical characteristic as the linear magnetization region  74 A 1 , and the linear magnetization region  80 A 2  is configured in the same manner as the linear magnetization region  74 A 2  shown in  FIG.  31   , and has the same geometrical characteristic as the linear magnetization region  74 A 2 . In addition, the linear magnetization region  80 A 3  is configured in the same manner as the linear magnetization region  80 A 1 , and has the same geometrical characteristic as the linear magnetization region  80 A 1 . 
     In the example shown in  FIG.  33   , the linear magnetization regions  80 A 1  and  80 A 2  are examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  80 A 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  80 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. In addition, the linear magnetization regions  80 A 2  and  80 A 3  are also examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  80 A 3  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  80 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     The servo pattern  78 B consists of the linear magnetization region group  80 B. The linear magnetization region group  80 B consists of linear magnetization regions  80 B 1 ,  80 B 2 , and  80 B 3 . The linear magnetization regions  80 B 1 ,  80 B 2 , and  80 B 3  are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The linear magnetization regions  80 B 1 ,  80 B 2 , and  80 B 3  are disposed in the order of the linear magnetization regions  80 B 1 ,  80 B 2 , and  80 B 3  from the upstream side in the forward direction. 
     The linear magnetization regions  80 B 1  and  80 B 2  are configured in the same manner as the linear magnetization region pair  74 B shown in  FIG.  31   , and have the same geometrical characteristics as the linear magnetization region pair  74 B. That is, the linear magnetization region  80 B 1  is configured in the same manner as the linear magnetization region  74 B 1  shown in  FIG.  31   , and has the same geometrical characteristic as the linear magnetization region  74 B 1 , and the linear magnetization region  80 B 2  is configured in the same manner as the linear magnetization region  74 B 2  shown in  FIG.  31   , and has the same geometrical characteristic as the linear magnetization region  74 B 2 . In addition, the linear magnetization region  80 B 3  is configured in the same manner as the linear magnetization region  80 B 1 , and has the same geometrical characteristic as the linear magnetization region  80 B 1 . 
     In the example shown in  FIG.  33   , the linear magnetization regions  80 B 1  and  80 B 2  are examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  80 B 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  80 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. In addition, the linear magnetization regions  80 B 2  and  80 B 3  are also examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  80 B 3  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  80 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     Eighth Modification Example 
     In the embodiment described above, the form example has been described in which, in the servo pattern  58 , the positions of both ends of each of the four magnetization straight lines  60 B 1   a  and the positions of both ends of each of the four magnetization straight lines  60 B 2   a  are aligned, but the technology of the present disclosure is not limited to this. For example, as shown in  FIG.  34   , in a servo pattern  84 , an overall position of the linear magnetization region  86 A 1  and an overall position of the linear magnetization region  86 A 2  may deviate from each other in the width direction WD. 
     In the example shown in  FIG.  34   , a plurality of servo patterns  84  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. The plurality of servo patterns  84  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT, similarly to the plurality of servo patterns  52  (see  FIG.  6   ) recorded in the magnetic tape MT 0  (see  FIG.  6   ). 
     In the example shown in  FIG.  34   , servo patterns  84 A and  84 B are shown as an example of the set of servo patterns  84 . The servo patterns  84 A and  84 B are adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The servo pattern  84 A is positioned on the upstream side in the forward direction, and the servo pattern  84 B is positioned on the downstream side in the forward direction. 
     The servo pattern  84  consists of a linear magnetization region pair  86 . The linear magnetization region pair  86  is classified into a linear magnetization region pair  86 A and a linear magnetization region pair  86 B. In the eighth modification example, the linear magnetization region pair  86  is an example of a “linear magnetization region pair” according to the technology of the present disclosure. 
     The servo pattern  84 A consists of the linear magnetization region pair  86 A. In the example shown in  FIG.  34   , linear magnetization regions  86 A 1  and  86 A 2  are shown as an example of the linear magnetization region pair  86 A. Each of the linear magnetization regions  86 A 1  and  86 A 2  is a linearly magnetized region. 
     In the eighth modification example, the linear magnetization region  86 A 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  86 A 2  is a “second linear magnetization region” according to the technology of the present disclosure. 
     The linear magnetization regions  86 A 1  and  86 A 2  are inclined in opposite directions with respect to the imaginary straight line C 1 . The linear magnetization regions  86 A 1  and  86 A 2  are not parallel to each other and are inclined at different angles with respect to the imaginary straight line C 1 . The linear magnetization region  86 A 1  has a steeper inclined angle with respect to the imaginary straight line C 1  than the linear magnetization region  86 A 2 . Here, “steep” means that, for example, an angle of the linear magnetization region  86 A 1  with respect to the imaginary straight line C 1  is smaller than an angle of the linear magnetization region  86 A 2  with respect to the imaginary straight line C 1 . 
     In addition, the overall position of the linear magnetization region  86 A 1  and the overall position of the linear magnetization region  86 A 2  deviate from each other in the width direction WD. That is, the position of one end of the linear magnetization region  86 A 1  and the position of one end of the linear magnetization region  86 A 2  are not uniform in the width direction WD, and the position of the other end of the linear magnetization region  86 A 1  and the position of the other end of the linear magnetization region  86 A 2  are not uniform in the width direction WD. 
     In the servo pattern  84 A, a plurality of magnetization straight lines  86 A 1   a  are included in the linear magnetization region  86 A 1 , and a plurality of magnetization straight lines  86 A 2   a  are included in the linear magnetization region  86 A 2 . The number of the magnetization straight lines  86 A 1   a  included in the linear magnetization region  86 A 1  is the same as the number of the magnetization straight lines  86 A 2   a  included in the linear magnetization region  86 A 2 . 
     The linear magnetization region  86 A 1  is a set of magnetization straight lines  86 A 1   a , which are five magnetized straight lines, and the linear magnetization region  86 A 2  is a set of magnetization straight lines  86 A 2   a , which are five magnetized straight lines. 
     In the servo band SB, the position of one end of each of all the magnetization straight lines  86 A 1   a  included in the linear magnetization region  86 A 1  in the width direction WD is aligned, and the position of the other end of each of all the magnetization straight lines  86 A 1   a  included in the linear magnetization region  86 A 1  in the width direction WD is also aligned. In addition, in the servo band SB, the position of one end of each of all the magnetization straight lines  86 A 2   a  included in the linear magnetization region  86 A 2  in the width direction WD is aligned, and the position of the other end of each of all the magnetization straight lines  86 A 2   a  included in the linear magnetization region  86 A 2  in the width direction WD is also aligned. 
     The servo pattern  84 B consists of the linear magnetization region pair  86 B. In the example shown in  FIG.  34   , linear magnetization regions  86 B 1  and  86 B 2  are shown as an example of the linear magnetization region pair  86 B. Each of the linear magnetization regions  86 B 1  and  86 B 2  is a linearly magnetized region. 
     In the eighth modification example, the linear magnetization region  86 B 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  86 B 2  is a “second linear magnetization region” according to the technology of the present disclosure. 
     The linear magnetization regions  86 B 1  and  86 B 2  are inclined in opposite directions with respect to the imaginary straight line C 2 . The linear magnetization regions  86 B 1  and  86 B 2  are not parallel to each other and are inclined at different angles with respect to the imaginary straight line C 2 . The linear magnetization region  86 B 1  has a steeper inclined angle with respect to the imaginary straight line C 2  than the linear magnetization region  86 B 2 . Here, “steep” means that, for example, an angle of the linear magnetization region  86 B 1  with respect to the imaginary straight line C 2  is smaller than an angle of the linear magnetization region  86 B 2  with respect to the imaginary straight line C 2 . 
     In addition, the overall position of the linear magnetization region  86 B 1  and the overall position of the linear magnetization region  86 B 2  deviate from each other in the width direction WD. That is, the position of one end of the linear magnetization region  86 B 1  and the position of one end of the linear magnetization region  86 B 2  are not uniform in the width direction WD, and the position of the other end of the linear magnetization region  86 B 1  and the position of the other end of the linear magnetization region  86 B 2  are not uniform in the width direction WD. 
     In the servo pattern  84 B, a plurality of magnetization straight lines  86 B 1   a  are included in the linear magnetization region  86 B 1 , and a plurality of magnetization straight lines  86 B 2   a  are included in the linear magnetization region  86 B 2 . The number of the magnetization straight lines  86 B 1   a  included in the linear magnetization region  86 B 1  is the same as the number of the magnetization straight lines  86 B 2   a  included in the linear magnetization region  86 B 2 . 
     The total number of the magnetization straight lines  86 B 1   a  and  86 B 2   a  included in the servo pattern  84 B is different from the total number of the magnetization straight lines  86 A 1   a  and  86 A 2   a  included in the servo pattern  84 A. In the example shown in  FIG.  34   , the total number of the magnetization straight lines  86 A 1   a  and  86 A 2   a  included in the servo pattern  84 A is ten, whereas the total number of the magnetization straight lines  86 B 1   a  and  86 B 2   a  included in the servo pattern  84 B is eight. 
     The linear magnetization region  86 B 1  is a set of magnetization straight lines  86 B 1   a , which are four magnetized straight lines, and the linear magnetization region  86 B 2  is a set of magnetization straight lines  86 B 2   a , which are four magnetized straight lines. 
     In the servo band SB, the position of one end of each of all the magnetization straight lines  86 B 1   a  included in the linear magnetization region  86 B 1  in the width direction WD is aligned, and the position of the other end of each of all the magnetization straight lines  86 B 1   a  included in the linear magnetization region  86 B 1  in the width direction WD is also aligned. In addition, in the servo band SB, the position of one end of each of all the magnetization straight lines  86 B 2   a  included in the linear magnetization region  86 B 2  in the width direction WD is aligned, and the position of the other end of each of all the magnetization straight lines  86 B 2   a  included in the linear magnetization region  86 B 2  in the width direction WD is also aligned. 
     It should be noted that, here, the set of magnetization straight lines  86 A 1   a , which are five magnetized straight lines, is described as an example of the linear magnetization region  86 A 1 , the set of magnetization straight lines  86 A 2   a , which are five magnetized straight lines, is described as an example of the linear magnetization region  86 A 2 , the set of magnetization straight lines  86 B 1   a , which are four magnetized straight lines, is described as an example of the linear magnetization region  86 B 1 , and the set of magnetization straight lines  86 B 2   a , which are four magnetized straight lines, is described as an example of the linear magnetization region  86 B 2 , but the technology of the present disclosure is not limited thereto. For example, the linear magnetization region  86 A 1  need only have the number of the magnetization straight lines  86 A 1   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT, the linear magnetization region  86 A 2  need only have the number of the magnetization straight lines  86 A 2   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT, the linear magnetization region  86 B 1  need only have the number of the magnetization straight lines  86 B 1   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT, and the linear magnetization region  86 B 2  need only have the number of the magnetization straight lines  86 B 2   a  that contribute to specifying the position of the magnetic head  28  on the magnetic tape MT. 
     Here, the geometrical characteristic of the linear magnetization region pair  86 A on the magnetic tape MT will be described with reference to  FIG.  35   . 
     As an example, as shown in  FIG.  35   , the geometrical characteristic of the linear magnetization region pair  86 A on the magnetic tape MT can be expressed by using an imaginary linear region pair  62 . Here, the entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining the symmetry axis SA 1  of the imaginary linear regions  62 A and  62 B at an angle α (for example, 10 degrees) with respect to the imaginary straight line C 1  with the center O 1  as the rotation axis. Moreover, the position of one end of each of all the straight lines  62 A 1  included in the imaginary linear region  62 A of the imaginary linear region pair  62  in this state in the width direction WD is aligned, and the position of the other end of each of all the straight lines  62 A 1  included in the imaginary linear region  62 A in the width direction WD is also aligned. In addition, similarly, the position of one end of each of all the straight lines  62 B 1  included in the imaginary linear region  62 B of the imaginary linear region pair  62  in the width direction WD is aligned, and the position of the other end of each of all the straight lines  62 B 1  included in the imaginary linear region  62 B in the width direction WD is also aligned. As a result, the imaginary linear region  62 A and the imaginary linear region  62 B deviate from each other in the width direction WD. 
     That is, one end of the imaginary linear region  62 A and one end of the imaginary linear region  62 B deviate from each other in the width direction WD at a regular interval Int 1 , and the other end of the imaginary linear region  62 A and the other end of the imaginary linear region  62 B deviate from each other in the width direction WD at a regular interval Int 2 . 
     The geometrical characteristic of the imaginary linear region pair  62  (that is, the geometrical characteristic of the imaginary servo pattern) obtained as described above corresponds to the geometrical characteristic of the actual servo pattern  84 A. That is, the geometrical characteristic of the linear magnetization region pair  86 A on the magnetic tape MT corresponds to the geometrical characteristic based on the imaginary linear region pair  62  inclined line-symmetrically with respect to the imaginary straight line C 1  in a case in which the entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining a symmetry axis SA 1  of the imaginary linear region  62 A and the imaginary linear region  62 B with respect to the imaginary straight line C 1 . 
     The imaginary linear region  62 A corresponds to the linear magnetization region  86 A 1  of the servo pattern  84 A, and the imaginary linear region  62 B corresponds to the linear magnetization region  86 A 2  of the servo pattern  84 A. Therefore, in the servo band SB, the servo pattern  84 A consisting of the linear magnetization region pair  86 A in which one end of the linear magnetization region  86 A 1  and one end of the linear magnetization region  86 A 2  deviate from each other in the width direction WD at the regular interval Int 1 , and the other end of the linear magnetization region  86 A 1  and the other end of the linear magnetization region  86 A 2  deviate from each other in the width direction WD at the regular interval Int 2  is recorded (see  FIG.  35   ). 
     It should be noted that the linear magnetization region pair  86 B is different from the linear magnetization region pair  86 A only in that the four magnetization straight lines  86 B 1   a  are provided instead of the five magnetization straight lines  86 A 1   a  and the four magnetization straight lines  86 B 2   a  are provided instead of the five magnetization straight lines  86 A 2   a  (see  FIG.  35   ). Therefore, in the servo band SB, the servo pattern  84 B consisting of the linear magnetization region pair  86 B in which one end of the linear magnetization region  86 B 1  and one end of the linear magnetization region  86 B 2  deviate from each other in the width direction WD at the regular interval Int 1 , and the other end of the linear magnetization region  86 B 1  and the other end of the linear magnetization region  86 B 2  deviate from each other in the width direction WD at the regular interval Int 2  is recorded (see  FIG.  35   ). 
     In the eighth modification example, similarly to the embodiment described above, as an example, as shown in  FIG.  35   , the inclination mechanism  49  skews the magnetic head  28  on the magnetic tape MT around the rotation axis RA such that the imaginary straight line C 3  is inclined with respect to the imaginary straight line C 1  to the upstream side in the forward direction at an angle γ (that is, the angle γ counterclockwise as viewed from the paper surface side of  FIG.  36   ). That is, the magnetic head  28  is inclined at the angle γ to the upstream side in the forward direction on the magnetic tape MT. The angle γ is close to the inclined angle of the servo pattern  86 . In this state, in a case in which the servo pattern  84 A is read by the servo reading element SR along the longitudinal direction LD within a range R in which the linear magnetization regions  86 A 1  and  86 A 2  overlap with each other in the width direction WD, the variation due to the azimuth loss between the servo pattern signal derived from the linear magnetization region  86 A 1  and the servo pattern signal derived from the linear magnetization region  86 A 2  is smaller than in the examples shown in  FIGS.  12  and  13   . In addition, also in a case in which the servo pattern  84 B (that is, the linear magnetization region pair  86 B) is read by the servo reading element SR, similarly, the variation due to the azimuth loss between the servo pattern signal derived from the linear magnetization region  86 B 1  and the servo pattern signal derived from the linear magnetization region  86 B 2  is small. 
     Next, an action of the magnetic tape system  10  according to the eighth modification example will be described focusing on the parts different from the embodiment described above. 
     In the magnetic tape drive  14  according to the eighth modification example, in a case in which the magnetic tape MT is subjected to the magnetic processing by the magnetic element unit  42  (see  FIGS.  3  and  17   ), the magnetic tape MT is pulled out from the magnetic tape cartridge  12 , and the servo pattern  84  in the servo band SB is read by the servo reading element SR of the magnetic head  28 . 
     As shown in  FIGS.  34  and  35   , the linear magnetization regions  86 A 1  and  86 A 2  included in the servo pattern  84 A recorded in the servo band SB of the magnetic tape MT are inclined in opposite directions with respect to the imaginary straight line C 1 . On the other hand, as shown in  FIG.  36   , the magnetic head  28  is also inclined to the upstream side in the forward direction by the angle γ (that is, the angle γ counterclockwise as viewed from the paper surface side of  FIG.  36   ) on the magnetic tape MT. In a case in which the servo pattern  84 A is read by the servo reading element SR along the longitudinal direction LD within a range R (see  FIG.  36   ) in this state, since the angle formed by the linear magnetization region  86 A 1  and the servo reading element SR and the angle formed by the linear magnetization region  86 A 2  and the servo reading element SR are close to each other, the variation in the servo pattern signal due to the azimuth loss is smaller than the variation generated between the servo pattern signal derived from the linear magnetization region  54 A 1  included in the known servo pattern  52 A in the related art and the servo pattern signal derived from the linear magnetization region  54 A 2  included in the known servo pattern  52 A in the related art. 
     As a result, the variation between the servo pattern signal derived from the linear magnetization region  86 A 1  and the servo pattern signal derived from the linear magnetization region  86 A 2  is smaller than the variation generated between the servo pattern signal derived from the linear magnetization region  54 A 1  included in the known servo pattern  52 A in the related art and the servo pattern signal derived from the linear magnetization region  54 A 2  included in the known servo pattern  52 A in the related art, and the servo pattern signal having higher reliability than the servo pattern signal obtained from the known servo pattern  52 A in the related art can be obtained. That is, the same effect as the first effect described in the embodiment described above can be obtained. It should be noted that, as shown in  FIG.  36   , also in a case in which the servo pattern  84 B is read by the servo reading element SR in a state in which the magnetic head  28  on the magnetic tape MT is inclined to the upstream side in the forward direction at the angle γ (that is, the angle γ counterclockwise as viewed from the paper surface side of  FIG.  36   ), the same effect as the second effect described in the embodiment described above can be obtained. 
     In addition, in the magnetic tape MT according to the eighth modification example, the linear magnetization region  86 A 1  is a set of five magnetization straight lines  86 A 1   a , and the linear magnetization region  86 A 2  is a set of five magnetization straight lines  86 A 2   a . In addition, the linear magnetization region  86 B 1  is a set of four magnetization straight lines  86 B 1   a , and the linear magnetization region  86 B 2  is a set of four magnetization straight lines  86 B 2   a . Therefore, an amount of information obtained from the servo pattern  84  can be increased as compared with a case in which each linear magnetization region consists of one magnetization straight line, and as a result, highly accurate servo control can be realized. That is, the same effect as the sixth effect described in the embodiment described above can be obtained. 
     In addition, in the magnetic tape MT according to the eighth modification example, the geometrical characteristic of the linear magnetization region pair  86 A on the magnetic tape MT corresponds to the geometrical characteristic of the imaginary linear region pair  62  in a case in which the entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining the symmetry axis SA 1  of the imaginary linear region pair  62  with respect to the imaginary straight line C 1 . Therefore, the variation between the servo pattern signal derived from the linear magnetization region  86 A 1  and the servo pattern signal derived from the linear magnetization region  86 A 2  can be made smaller than in a case in which the servo pattern  52 A having the known geometrical characteristic in the related art is read by the servo reading element SR. As a result, it is possible to obtain the servo pattern signal having higher reliability than the servo pattern signal obtained from the servo pattern  52 A having the known geometrical characteristic in the related art. That is, the same effect as the seventh effect described in the embodiment described above can be obtained. 
     It should be noted that the linear magnetization region pair  86 B is different from the linear magnetization region pair  86 A only in that the linear magnetization region  86 B 1  is provided instead of the linear magnetization region  86 A 1 , and the linear magnetization region  86 B 2  is provided instead of the linear magnetization region  86 A 2 . The linear magnetization region pair  86 B configured as described above is also read by the servo reading element SR within the range R (see  FIG.  36   ) along the longitudinal direction LD, similarly to the linear magnetization region pair  86 A. Therefore, the variation between the servo pattern signal derived from the linear magnetization region  86 B 1  and the servo pattern signal derived from the linear magnetization region  86 B 2  can be made smaller than in a case in which the servo pattern  52 B having the known geometrical characteristic in the related art is read by the servo reading element SR. As a result, it is possible to obtain the servo pattern signal having higher reliability than the servo pattern signal obtained from the servo pattern  52 B having the known geometrical characteristic in the related art. That is, the same effect as the eighth effect described in the embodiment described above can be obtained. 
     Ninth Modification Example 
     In the eighth modification example, the form example has been described in which the plurality of V-shaped servo patterns  84  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT, but the technology of the present disclosure is not limited to this. For example, as shown in  FIG.  37   , a servo pattern  90  may be an M-shaped magnetized servo pattern. A plurality of servo patterns  90  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. The plurality of servo patterns  72  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT, similarly to the plurality of servo patterns  84 . 
     In the example shown in  FIG.  37   , servo patterns  90 A and  90 B are shown as an example of the set of servo patterns  90 . Each of the servo patterns  90 A and  90 B is an M-shaped magnetized servo pattern. The servo patterns  90 A and  90 B are adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The servo pattern  90 A is positioned on the upstream side in the forward direction, and the servo pattern  90 B is positioned on the downstream side in the forward direction. 
     As an example, as shown in  FIG.  38   , the servo pattern  90  consists of a linear magnetization region pair  92 . The linear magnetization region pair  92  is classified into a linear magnetization region pair  92 A and a linear magnetization region pair  92 B. The servo pattern  90 A consists of a set of linear magnetization region pairs  92 A. The set of linear magnetization region pairs  92 A are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. 
     In the example shown in  FIG.  38   , linear magnetization regions  92 A 1  and  92 A 2  are shown as an example of the linear magnetization region pair  92 A. The linear magnetization region pair  92 A is configured in the same manner as the linear magnetization region pair  86 A (see  FIG.  34   ) described in the eighth modification example, and has the same geometrical characteristic as the linear magnetization region pair  86 A. That is, the linear magnetization region  92 A 1  is configured in the same manner as the linear magnetization region  86 A 1  (see  FIG.  34   ) described in the eighth modification example and has the same geometrical characteristic as the linear magnetization region  86 A 1 , and the linear magnetization region  92 A 2  is configured in the same manner as the linear magnetization region  86 A 2  (see  FIG.  34   ) described in the eighth modification example and has the same geometrical characteristic as the linear magnetization region  86 A 2 . 
     In the example shown in  FIG.  38   , the linear magnetization region pair  92 A is an example of a “linear magnetization region pair” according to the technology of the present disclosure, the linear magnetization region  92 A 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  92 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     The servo pattern  90 B consists of a set of linear magnetization region pairs  92 B. The set of linear magnetization region pairs  92 B are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. 
     In the example shown in  FIG.  38   , linear magnetization regions  92 B 1  and  92 B 2  are shown as an example of the linear magnetization region pair  92 B. The linear magnetization region pair  92 B is configured in the same manner as the linear magnetization region pair  86 B (see  FIG.  34   ) described in the eighth modification example, and has the same geometrical characteristic as the linear magnetization region pair  86 B. That is, the linear magnetization region  92 B 1  is configured in the same manner as the linear magnetization region  86 B 1  (see  FIG.  34   ) described in the eighth modification example and has the same geometrical characteristic as the linear magnetization region  86 B 1 , and the linear magnetization region  92 B 2  is configured in the same manner as the linear magnetization region  86 B 2  (see  FIG.  34   ) described in the eighth modification example and has the same geometrical characteristic as the linear magnetization region  86 B 2 . 
     In the example shown in  FIG.  38   , the linear magnetization region pair  92 B is an example of a “linear magnetization region pair” according to the technology of the present disclosure, the linear magnetization region  92 B 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  92 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     Tenth Modification Example 
     In the example shown in  FIG.  37   , the form example has been described in which the plurality of M-shaped servo patterns  90  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT, but the technology of the present disclosure is not limited to this. For example, as shown in  FIG.  39   , a servo pattern  96  may be an N-shaped magnetized servo pattern. A plurality of servo patterns  96  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. Similarly to the plurality of servo patterns  90  (see  FIG.  37   ), the plurality of servo patterns  96  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT. 
     In the example shown in  FIG.  39   , servo patterns  96 A and  96 B are shown as an example of the set of servo patterns  96 . Each of the servo patterns  96 A and  96 B is an N-shaped magnetized servo pattern. The servo patterns  96 A and  96 B are adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The servo pattern  96 A is positioned on the upstream side in the forward direction, and the servo pattern  96 B is positioned on the downstream side in the forward direction. 
     As an example, as shown in  FIG.  40   , the servo pattern  96  consists of a linear magnetization region group  98 . The linear magnetization region group  98  is classified into a linear magnetization region group  98 A and a linear magnetization region group  98 B. 
     The servo pattern  96 A consists of the linear magnetization region group  98 A. The linear magnetization region group  98 A consists of linear magnetization regions  98 A 1 ,  98 A 2 , and  98 A 3 . The linear magnetization regions  98 A 1 ,  98 A 2 , and  98 A 3  are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The linear magnetization regions  98 A 1 ,  98 A 2 , and  98 A 3  are disposed in the order of the linear magnetization regions  98 A 1 ,  98 A 2 , and  98 A 3  from the upstream side in the forward direction. 
     The linear magnetization regions  98 A 1  and  98 A 2  are configured in the same manner as the linear magnetization region pair  92 A shown in  FIG.  38   , and have the same geometrical characteristics as the linear magnetization region pair  92 A. That is, the linear magnetization region  98 A 1  is configured in the same manner as the linear magnetization region  92 A 1  shown in  FIG.  38   , and has the same geometrical characteristic as the linear magnetization region  92 A 1 , and the linear magnetization region  98 A 2  is configured in the same manner as the linear magnetization region  92 A 2  shown in  FIG.  38   , and has the same geometrical characteristic as the linear magnetization region  92 A 2 . In addition, the linear magnetization region  98 A 3  is configured in the same manner as the linear magnetization region  92 A 1 , and has the same geometrical characteristic as the linear magnetization region  92 A 1 . 
     In the example shown in  FIG.  40   , the linear magnetization regions  98 A 1  and  98 A 2  are examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  98 A 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  98 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. In addition, the linear magnetization regions  98 A 2  and  98 A 3  are also examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  98 A 3  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  98 A 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     The servo pattern  96 B consists of the linear magnetization region group  98 B. The linear magnetization region group  98 B consists of linear magnetization regions  98 B 1 ,  98 B 2 , and  98 B 3 . The linear magnetization regions  98 B 1 ,  98 B 2 , and  98 B 3  are disposed in a state of being adjacent to each other along the longitudinal direction LD of the magnetic tape MT. The linear magnetization regions  98 B 1 ,  98 B 2 , and  98 B 3  are disposed in the order of the linear magnetization regions  98 B 1 ,  98 B 2 , and  98 B 3  from the upstream side in the forward direction. 
     The linear magnetization regions  98 B 1  and  98 B 2  are configured in the same manner as the linear magnetization region pair  92 B shown in  FIG.  38   , and have the same geometrical characteristics as the linear magnetization region pair  92 B. That is, the linear magnetization region  98 B 1  is configured in the same manner as the linear magnetization region  92 B 1  shown in  FIG.  38   , and has the same geometrical characteristic as the linear magnetization region  92 B 1 , and the linear magnetization region  98 B 2  is configured in the same manner as the linear magnetization region  92 B 2  shown in  FIG.  38   , and has the same geometrical characteristic as the linear magnetization region  92 B 2 . In addition, the linear magnetization region  98 B 3  is configured in the same manner as the linear magnetization region  92 B 1 , and has the same geometrical characteristic as the linear magnetization region  92 B 1 . 
     In the example shown in  FIG.  40   , the linear magnetization regions  98 B 1  and  98 B 2  are examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  98 B 1  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  98 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. In addition, the linear magnetization regions  98 B 2  and  98 B 3  are also examples of a “linear magnetization region pair” according to the technology of the present disclosure, and in this case, the linear magnetization region  98 B 3  is an example of a “first linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  98 B 2  is an example of a “second linear magnetization region” according to the technology of the present disclosure. 
     Eleventh Modification Example 
     In the embodiment described above, the form example has been described in which the servo format information SF is stored in the cartridge memory  24 , but the technology of the present disclosure is not limited to this. In an eleventh modification example, the servo format information SF is stored in the magnetic tape MT. The magnetic tape MT is an example of a “storage medium” according to the technology of the present disclosure. 
     As an example, as shown in  FIG.  41   , the servo format information SF is stored in the BOT region MT 1  provided at the beginning of the magnetic tape MT. The control device  30  acquires a data band signal (that is, a signal indicating the servo format information SF) which is a result of reading the data band DB of the BOT region MT 1  by the data read/write element DRW (see  FIG.  6   ). The control device  30  performs the servo control, the skew angle control, and/or the tension control. It should be noted that the servo format information SF may be recorded in the EOT region MT 2  provided at the end of the magnetic tape MT, or the servo format information SF may be recorded in the BOT region MT 1  and the EOT region MT 2 . An aspect may be adopted in which a part of the servo format information SF is recorded in the magnetic tape MT and a remainder of the servo format information SF is stored in the cartridge memory  24 . 
     As described above, according to the eleventh modification example, the servo format information SF is recorded in the BOT region MT 1  of the magnetic tape MT. Therefore, with the present configuration, it is possible to more easily realize the storage of the servo format information SF than in case in which a separate storage medium is provided for the magnetic tape cartridge  12 . 
     Twelfth Modification Example 
     In the embodiment described above, the form example has been described in which, in the servo pattern  58 , the linear magnetization region  60 A 1  has a steeper inclined angle with respect to the imaginary straight line C 1  than the linear magnetization region  60 A 2 , but the technology of the present disclosure is not limited to this. For example, as shown in  FIG.  42   , a linear magnetization region  600 A 2  may have a steeper inclined angle with respect to the imaginary straight line C 1  than a linear magnetization region  600 A 1 . A plurality of servo patterns  580  are recorded in the servo band SB along the longitudinal direction LD of the magnetic tape MT. The plurality of servo patterns  580  are disposed at regular intervals along the longitudinal direction LD of the magnetic tape MT, similarly to the plurality of servo patterns  58 . 
     The servo pattern  580  consists of a linear magnetization region pair  600 . In a twelfth modification example, the linear magnetization region pair  600  is an example of a “linear magnetization region pair” according to the technology of the present disclosure. 
     The linear magnetization region pair  600  is classified into a linear magnetization region pair  600 A and a linear magnetization region pair  600 B. That is, the linear magnetization region pair  600  is different from the linear magnetization region pair  60  in that the linear magnetization region pair  600 A is provided instead of the linear magnetization region pair  60 A, and the linear magnetization region pair  600 B is provided instead of the linear magnetization region pair  60 B. 
     The servo pattern  580 A consists of the linear magnetization region pair  600 A. The linear magnetization region pair  600 A is different from the linear magnetization region pair  60 A in that the linear magnetization region  600 A 1  is provided instead of the linear magnetization region  60 A 1 , and the linear magnetization region  600 A 2  is provided instead of the linear magnetization region  60 A 2 . Each of the linear magnetization regions  600 A 1  and  600 A 2  is a linearly magnetized region. In the twelfth modification example, the linear magnetization region  600 A 1  is an example of a “second linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  600 A 2  is a “first linear magnetization region” according to the technology of the present disclosure. 
     The linear magnetization regions  600 A 1  and  600 A 2  are inclined in opposite directions with respect to the imaginary straight line C 1 . The linear magnetization regions  600 A 1  and  600 A 2  are not parallel to each other and are inclined at different angles with respect to the imaginary straight line C 1 . The linear magnetization region  600 A 2  has a steeper inclined angle with respect to the imaginary straight line C 1  than the linear magnetization region  600 A 1 . Here, “steep” means that, for example, an angle of the linear magnetization region  600 A 2  with respect to the imaginary straight line C 1  is smaller than an angle of the linear magnetization region  600 A 1  with respect to the imaginary straight line C 1 . In addition, a total length of the linear magnetization region  600 A 2  is shorter than a total length of the linear magnetization region  600 A 1 . 
     The linear magnetization region  600 A 1  is different from the linear magnetization region  60 A 1  in that a plurality of magnetization straight lines  600 A 1   a  are provided instead of the plurality of magnetization straight lines  60 A 1   a . The linear magnetization region  600 A 2  is different from the linear magnetization region  60 A 2  in that a plurality of magnetization straight lines  600 A 2   a  are provided instead of the plurality of magnetization straight lines  60 A 2   a.    
     The plurality of magnetization straight lines  600 A 1   a  are included in the linear magnetization region  600 A 1 , and the plurality of magnetization straight lines  600 A 2  a are included in the linear magnetization region  600 A 2 . The number of the magnetization straight lines  600 A 1   a  included in the linear magnetization region  600 A 1  is the same as the number of the magnetization straight lines  600 A 2   a  included in the linear magnetization region  600 A 2 . 
     The linear magnetization region  600 A 1  is a linear magnetization region corresponding to a first line symmetry region. The first line symmetry region refers to a region in which the linear magnetization region  60 A 2  (see  FIG.  9   ) described in the first embodiment is formed line-symmetrically with respect to the imaginary straight line C 1 . That is, the linear magnetization region  600 A 1  can be said to be a linear magnetization region formed by a geometrical characteristic of a mirror image of the linear magnetization region  60 A 2  (see  FIG.  9   ) (that is, geometrical characteristic obtained by performing the mirror image with respect to the linear magnetization region  60 A 2  (see  FIG.  9   ) with the imaginary straight line C 1  as a line symmetry axis). 
     The linear magnetization region  600 A 2  is a linear magnetization region corresponding to a second line symmetry region. The second line symmetry region refers to a region in which the linear magnetization region  60 A 1  (see  FIG.  9   ) described in the first embodiment is formed line-symmetrically with respect to the imaginary straight line C 1 . That is, the linear magnetization region  600 A 2  can be said to be a linear magnetization region formed by a geometrical characteristic of a mirror image of the linear magnetization region  60 A 1  (see  FIG.  9   ) (that is, geometrical characteristic obtained by performing the mirror image with respect to the linear magnetization region  60 A 1  (see  FIG.  9   ) with the imaginary straight line C 1  as a line symmetry axis). 
     That is, in the example shown in  FIG.  10   , the geometrical characteristic of the imaginary linear region pair  62  obtained by aligning the positions of both ends of the imaginary linear region  62 A and the positions of both ends of the imaginary linear region  62 B in a case in which the entirety of the imaginary linear region pair  62  is inclined with respect to the imaginary straight line C 1  by inclining the symmetry axis SA 1  of the imaginary linear regions  62 A and  62 B with respect to the imaginary straight line C 1  at the angle α clockwise as viewed from the paper surface side of  FIG.  10    with the center O 1  as the rotation axis corresponds to the geometrical characteristic of the servo pattern  580 A. 
     The servo pattern  580 B consists of the linear magnetization region pair  600 B. The linear magnetization region pair  600 B is different from the linear magnetization region pair  60 B in that the linear magnetization region  600 B 1  is provided instead of the linear magnetization region  60 B 1 , and the linear magnetization region  600 B 2  is provided instead of the linear magnetization region  60 B 2 . Each of the linear magnetization regions  600 B 1  and  600 B 2  is a linearly magnetized region. In the twelfth modification example, the linear magnetization region  600 B 1  is an example of a “second linear magnetization region” according to the technology of the present disclosure, and the linear magnetization region  600 B 2  is a “first linear magnetization region” according to the technology of the present disclosure. 
     The linear magnetization regions  600 B 1  and  600 B 2  are inclined in opposite directions with respect to the imaginary straight line C 2 . The linear magnetization regions  600 B 1  and  600 B 2  are not parallel to each other and are inclined at different angles with respect to the imaginary straight line C 2 . The linear magnetization region  600 B 2  has a steeper inclined angle with respect to the imaginary straight line C 2  than the linear magnetization region  600 B 1 . Here, “steep” means that, for example, an angle of the linear magnetization region  600 B 2  with respect to the imaginary straight line C 2  is smaller than an angle of the linear magnetization region  600 B 1  with respect to the imaginary straight line C 2 . 
     The plurality of magnetization straight lines  600 B 1   a  are included in the linear magnetization region  600 B 1 , and the plurality of magnetization straight lines  600 B 2   a  are included in the linear magnetization region  600 B 2 . The number of the magnetization straight lines  600 B 1   a  included in the linear magnetization region  600 B 1  is the same as the number of the magnetization straight lines  600 B 2   a  included in the linear magnetization region  600 B 2 . 
     The total number of the magnetization straight lines  600 B 1   a  and  600 B 2   a  included in the servo pattern  580 B is different from the total number of the magnetization straight lines  600 A 1   a  and  600 A 2   a  included in the servo pattern  580 A. In the example shown in  FIG.  42   , the total number of the magnetization straight lines  600 A 1   a  and  600 A 2   a  included in the servo pattern  580 A is ten, whereas the total number of the magnetization straight lines  600 B 1   a  and  600 B 2   a  included in the servo pattern  580 B is eight. 
     The linear magnetization region  600 B 1  is a set of magnetization straight lines  600 B 1   a , which are four magnetized straight lines, and the linear magnetization region  600 B 2  is a set of magnetization straight lines  600 B 2   a , which are four magnetized straight lines. In the servo band SB, the positions of both ends of the linear magnetization region  600 B 1  (that is, the positions of both ends of each of the four magnetization straight lines  600 B 1   a ) and the positions of both ends of the linear magnetization region  600 B 2  (that is, the positions of both ends of each of the four magnetization straight lines  600 B 2   a ) are aligned in the width direction WD. 
     As described above, the geometrical characteristic of the servo pattern  580 A corresponds to the geometrical characteristic of the mirror image of the linear magnetization region  60 A 2  (see  FIG.  9   ) and the geometrical characteristic of the mirror image of the linear magnetization region  60 A 2  (see  FIG.  9   ) (that is, geometrical characteristic of the mirror image of the servo pattern  58 A (see  FIG.  9   ) shown in  FIG.  9   ), and the geometrical characteristic of the servo pattern  580 B corresponds to the geometrical characteristic of the mirror image of the linear magnetization region  60 B 2  (see  FIG.  9   ) and the geometrical characteristic of the mirror image of the linear magnetization region  60 B 2  (see  FIG.  9   ) (that is, geometrical characteristic of the mirror image of the servo pattern  58 B (see  FIG.  9   ) shown in  FIG.  9   ). However, this is merely an example, and instead of the servo pattern  580 , the servo pattern formed by the geometrical characteristic of the mirror image of the servo pattern  72  shown in  FIG.  30   , the geometrical characteristic of the mirror image of the servo pattern  78  shown in  FIG.  32   , the geometrical characteristic of the mirror image of the servo pattern  84  shown in  FIG.  34   , the geometrical characteristic of the mirror image of the servo pattern  90  shown in  FIG.  37   , or the geometrical characteristic of the mirror image of the servo pattern  96  shown in  FIG.  39    may be applied. 
     EXAMPLES 
     A PES fluctuation range of the magnetic tape MT was evaluated by using the magnetic tape system  10  according to the present embodiment. The evaluation results were shown in Table 1. 
     
       
         
           
               
               
               
               
               
               
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Example 
                 Example 
                 Example 
                 Example 
                 Example 
                 Example 
                 Comparative 
                 Comparative 
               
               
                   
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 Example 1 
                 Example 2 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Information on skew 
                 With 
                 Without 
                 With 
                 With 
                 With 
                 With 
                 Without 
                 Without 
               
               
                 angle of servo pattern 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
               
               
                 recording head 
               
               
                 Information on inclined 
                 Without 
                 With 
                 With 
                 With 
                 With 
                 With 
                 Without 
                 Without 
               
               
                 angle of servo pattern 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
               
               
                 estimated by magnetic 
               
               
                 development 
               
               
                 Ideal waveform signal 
                 Without 
                 Without 
                 Without 
                 With 
                 With 
                 With 
                 Without 
                 Without 
               
               
                   
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
               
               
                 Information on tape 
                 Without 
                 Without 
                 Without 
                 Without 
                 With 
                 With 
                 Without 
                 With 
               
               
                 width 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
               
               
                 Width adjustment 
                 Without 
                 Without 
                 Without 
                 Without 
                 Without 
                 With 
                 Without 
                 With 
               
               
                 information for adjusting 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
                 storage 
               
               
                 tape width 
               
               
                 PES fluctuation range 
                 16 
                 13 
                 12 
                 10 
                 8 
                 7 
                 23 
                 20 
               
               
                 (nm) 
               
               
                   
               
            
           
         
       
     
     As shown in Table 1 as an example, in Example 1, the information indicating the skew angle of the servo pattern recording head WH (that is, the inclined angle α of the servo pattern  58  in a case in which the servo pattern  58  is recorded) was stored in the cartridge memory  24  as the servo format information SF. Moreover, based on the information indicating the skew angle of the servo pattern recording head WH, the magnetic head skew angle was adjusted to perform the read/write of the data with respect to the magnetic tape MT. As a result, the PES fluctuation range was 16 nm. In Example 2, the inclined angle α of the servo pattern  58  estimated by magnetic development was stored in the cartridge memory  24  as the servo format information SF. Moreover, based on the inclined angle α of the servo pattern  58  estimated by magnetic development, the magnetic head skew angle was adjusted to perform read/write of the data with respect to the magnetic tape MT. As a result, the PES fluctuation range was 13 nm. 
     In Example 3, the servo format information SF used in Examples 1 and 2 was stored in the cartridge memory  24  as the servo format information SF. Moreover, based on the servo format information SF used in Examples 1 and 2, the magnetic head skew angle was adjusted to perform read/write of the data with respect to the magnetic tape MT. As a result, the PES fluctuation range was 12 nm. In Example 4, as the servo format information SF, in addition to the servo format information SF used in Examples 1 and 2, the ideal waveform signal  67  in accordance with the inclined angle α of the servo pattern  58  was stored in the cartridge memory  24 . Moreover, based on the servo format information SF used in Examples 1 and 2 and the ideal waveform signal  67  in accordance with the inclined angle α of the servo pattern  58 , the magnetic head skew angle was adjusted to perform read/write with respect to the magnetic tape MT. As a result, the PES fluctuation range was 10 nm. 
     In Example 5, the magnetic tape width change information SF 2  was stored as the servo format information SF in addition to the servo format information SF used in Examples 1 to 4. Moreover, based on the servo format information SF and the magnetic tape width change information SF 2  used in Examples 1 to 4, the magnetic head skew angle was adjusted to perform read/write with respect to the magnetic tape MT. As a result, the PES fluctuation range was 8 nm. In Example 6, as the servo format information SF, in addition to the servo format information SF used in Examples 1 to 5, the width adjustment information SF 4  was stored in the cartridge memory  24 . Moreover, the magnetic head skew angle was adjusted based on the servo format information SF used in Examples 1 to 5, and the tape width W was adjusted further based on the width adjustment information SF 4  to perform read/write with respect to the magnetic tape MT. As a result, the PES fluctuation range was 7 nm. All the PES fluctuation ranges of Examples 1 to 6 were equal to or less than 18 nm which is a preferable range of the PES fluctuation range. 
     In Comparative Example 1, read/write with respect to the magnetic tape MT was performed without using the servo pattern inclination information SF 1  as the servo format information SF. As a result, the PES fluctuation range was 23 nm. In Comparative Example 2, the magnetic tape width change information SF 2  and the width adjustment information SF 4  were stored in the cartridge memory  24 . Moreover, based on the magnetic tape width change information SF 2  and the width adjustment information SF 4 , the tape width W was adjusted to perform read/write with respect to the magnetic tape MT. As a result, the PES fluctuation range was 20 nm. All the PES fluctuation range of Comparative Example 1 and Comparative Example 2 exceeded the preferable range of the PES fluctuation range (that is, equal to or less than 18 nm). 
     Other Modification Examples 
     In the embodiment described above, the magnetic tape system  10  has been described in which the magnetic tape cartridge  12  can be inserted and removed with respect to the magnetic tape drive  14 , but the technology of the present disclosure is not limited to this. For example, even in a case of the magnetic tape system in which at least one magnetic tape cartridge  12  is loaded in advance into the magnetic tape drive  14  (that is, the magnetic tape system in which at least one magnetic tape cartridge  12  and the magnetic tape drive  14  are integrated in advance), the technology of the present disclosure is established. 
     In the embodiment described above, the single magnetic head  28  has been described, but the technology of the present disclosure is not limited to this. For example, a plurality of magnetic heads  28  may be disposed on the magnetic tape MT. For example, the magnetic head  28  for reading and at least one magnetic head  28  for writing may be disposed on the magnetic tape MT. The magnetic head  28  for reading may be used for verifying the data recorded in the data band DB by the magnetic head  28  for writing. In addition, one magnetic head on which the magnetic element unit  42  for reading and at least one magnetic element unit  42  for writing are mounted may be disposed on the magnetic tape MT. 
     In the embodiment described above, the form example has been described in which the servo format information SF is stored in the cartridge memory  24  at the manufacturing stage of the magnetic tape cartridge  12 , but the technology of the present disclosure is not limited to this. For example, the servo format information SF may be recorded after the magnetic tape cartridge  12  is shipped, or may be recorded at a stage of using the magnetic tape cartridge  12  (that is, a stage in which read/write of the data is performed with respect to the magnetic tape MT). In addition, the servo format information SF stored in the cartridge memory  24  may be updated. 
     In addition, in the embodiment described above, the form example has been described in which the PES is calculated by using Expression (1), but the technology of the present disclosure is not limited to this. For example, the PES may be calculated by using Expression (2). 
     
       
         
           
             
               
                 
                   
                     y 
                     ^ 
                   
                   = 
                   
                     
                       d 
                       
                         
                           tan 
                           ⁡ 
                           ( 
                           
                             θ 
                             Ai 
                           
                           ) 
                         
                         - 
                         
                           tan 
                           ⁡ 
                           ( 
                           
                             θ 
                             Bi 
                           
                           ) 
                         
                       
                     
                     ⁢ 
                     
                       ( 
                       
                         
                           1 
                           2 
                         
                         - 
                         
                           
                             Σ 
                             ⁢ 
                             
                               A 
                               i 
                             
                           
                           
                             Σ 
                             ⁢ 
                             
                               B 
                               i 
                             
                           
                         
                       
                       ) 
                     
                   
                 
               
               
                 
                   ( 
                   2 
                   ) 
                 
               
             
           
         
       
       
         
           
             
               y 
               ^ 
             
             : 
                 
             PES 
           
         
       
       
         
           
             d 
             : 
                
             Pitch 
             ⁢ 
                 
             width 
             ⁢ 
                 
             of 
             ⁢ 
                 
             servo 
             ⁢ 
                 
             pattern 
             ⁢ 
                 
             in 
             ⁢ 
                 
             traveling 
             ⁢ 
                 
             direction 
           
         
       
       
         
           
             
               A 
               i 
             
             : 
                
             Second 
             ⁢ 
                 
             distance 
           
         
       
       
         
           
             
               B 
               i 
             
             : 
                
             First 
             ⁢ 
                 
             distance 
           
         
       
     
     Here, in Expression (2), the meaning of ΣAi refers to, for example, the sum of the second distances obtained from all the magnetization region pairs in one servo pattern  58 A. In addition, the meaning of ΣBi refers to, for example, the sum of the first distances obtained from all the magnetization region pairs in one servo pattern  58 A. The magnetization region pair refers to a combination of the magnetization straight line  60 A 1   a  and the magnetization straight line  60 B 1   a  having a corresponding positional relationship. 
     In addition, in the embodiment described above, the form example has been described in which the ideal waveform signal  67  is the ideal waveform of the servo pattern signal which is the result read by the servo reading element SR provided in the magnetic head  28 , but technology of the present disclosure is not limited to this. For example, the ideal waveform signal may be the ideal waveform signal indicating the ideal waveform of the servo pattern signal which is the result read by the verification head VH. 
     In addition, in the embodiment described above, the form example has been described in which the control device  30  (see  FIG.  3   ) is realized by the ASIC, but the technology of the present disclosure is not limited to this, and the control device  30  may be realized by a software configuration. In addition, only the position detection unit  30 B provided in the control device  30  may be realized by the software configuration. In a case in which the position detection unit  30 B is realized by the software configuration, for example, as shown in  FIG.  43   , the position detection unit  30 B comprises a computer  100 . The computer  100  includes a processor  100 A (for example, a single CPU or a plurality of CPUs), an NVM  100 B, and a RAM  100 C. The processor  100 A, the NVM  100 B, and the RAM  100 C are connected to a bus  100 D. A servo pattern detection program PG is stored in a portable storage medium  102  (for example, an SSD or a USB memory) which is a computer-readable non-transitory storage medium. 
     The servo pattern detection program PG stored in the storage medium  102  is installed in the computer  100 . The processor  100 A executes the servo pattern detection processing (see  FIG.  19   ) in accordance with the servo pattern detection program PG. 
     In addition, the servo pattern detection program PG may be stored in a storage device of another computer or server device connected to the computer  100  via a communication network (not shown), and the servo pattern detection program PG may be downloaded in response to a request from the position detection unit  30 B and installed in the computer  100 . It should be noted that the servo pattern detection program PG is an example of a “program” according to the technology of the present disclosure, and the computer  100  is an example of a “computer” according to the technology of the present disclosure. 
     In the example shown in  FIG.  43   , although the computer  100  has been described as an example, the technology of the present disclosure is not limited to this, and a device including an ASIC, an FPGA, and/or a PLC may be applied instead of the computer  100 . In addition, instead of the computer  100 , a hardware configuration and a software configuration may be used in combination. 
     As the hardware resource for executing the processing of the control device  30  (see  FIG.  3   ) and/or the servo writer controller SW 5  (see  FIG.  18   ), various processors shown below can be used. Examples of the processor include the CPU which is a general-purpose processor functioning as the hardware resource for executing the processing by executing software, that is, a program. In addition, examples of the processor include a dedicated electric circuit which is a processor having a circuit configuration designed to be dedicated to executing specific processing, such as an FPGA, a PLC, or an ASIC described as an example. A memory is built in or connected to any processor, and any processor executes the processing by using the memory. 
     The hardware resource for executing the processing of the control device  30  and/or the servo writer controller SW 5  may be composed of one of those various processors or may be composed of a combination of two or more processors of the same type or different types (for example, a combination of a plurality of FPGAs or a combination of a CPU and an FPGA). In addition, the hardware resource for executing the processing of the control device  30  and/or the servo writer controller SW 5  may be one processor. 
     As a configuring example of one processor, first, there is a form in which one processor is composed of a combination of one or more CPUs and software and the processor functions as the hardware resource for executing the processing. Secondly, as represented by SoC, there is a form in which a processor that realizes the functions of the entire system including a plurality of hardware resources for executing the processing with one IC chip is used. As described above, the processing of the control device  30  and/or the servo writer controller SW 5  is realized by using one or more of the various processors described above as the hardware resource. 
     Further, as the hardware structure of these various processors, more specifically, it is possible to use an electric circuit in which circuit elements, such as semiconductor elements, are combined. In addition, the processing of the control device  30  and/or the servo writer controller SW 5  is merely an example. Therefore, it is needless to say that unnecessary steps may be deleted, new steps may be added, or the processing order may be changed within a range that does not deviate from the gist. 
     The description contents and the shown contents above are the detailed description of the parts according to the technology of the present disclosure, and are merely examples of the technology of the present disclosure. For example, the description of the configuration, the function, the action, and the effect above are the description of examples of the configuration, the function, the action, and the effect of the parts according to the technology of the present disclosure. Accordingly, it is needless to say that unnecessary parts may be deleted, new elements may be added, or replacements may be made with respect to the contents described and shown above within a range that does not deviate from the gist of the technology of the present disclosure. In addition, in order to avoid complications and facilitate understanding of the parts according to the technology of the present disclosure, in the description contents and the shown contents above, the description of common technical knowledge and the like that do not particularly require description for enabling the implementation of the technology of the present disclosure are omitted. 
     In the present specification, “A and/or B” is synonymous with “at least one of A or B”. That is, “A and/or B” means that it may be only A, only B, or a combination of A and B. In addition, in the present specification, in a case in which three or more matters are associated and expressed by “and/or”, the same concept as “A and/or B” is applied. 
     All documents, patent applications, and technical standards described in the present specification are incorporated into the present specification by reference to the same extent as in a case in which the individual documents, patent applications, and technical standards are specifically and individually stated to be described by reference.