Patent Publication Number: US-11657854-B2

Title: System and method for rapid replacement of robotic media mover in automated media library

Description:
RELATED APPLICATION 
     This application is a Continuation Application and claims the benefit under 35 U.S.C. 120 on co-pending U.S. patent application Ser. No. 16/677,529, filed on Nov. 7, 2019, and entitled “SYSTEM AND METHOD FOR RAPID REPLACEMENT OF ROBOTIC MEDIA MOVER IN AUTOMATED MEDIA LIBRARY”. As far as permitted, the contents of U.S. patent application Ser. No. 16/677,529 are incorporated in their entirety herein by reference. 
    
    
     BACKGROUND 
     Automated media libraries are commonly utilized for purposes of writing data to and reading data from media cartridges. In particular, the automated media libraries typically include a robotic media mover that selectively retrieves and/or moves media cartridges as desired between storage slots and media drives within the media library. More specifically, upon receiving a signal to access a certain media cartridge, the media mover can be manipulated to physically retrieve the requested media cartridge from its associated storage slot in the media library. Subsequently, the media mover moves the media cartridge to an appropriate media drive, and inserts the media cartridge into a drive housing of the media drive so that requested read/write operations can be performed. Upon completion of the requested read/write operations, the media mover can then return the media cartridge to an appropriate storage slot. 
     Unfortunately, in current media libraries, most media movers can be very difficult to remove or replace from the media library when such removal or replacement is warranted. For example, removal or replacement of the media movers often requires partial disassembly of the media library or elaborate procedures to get them out. Some such procedures even require cutting electrical cables to accomplish removal. Accordingly, it is desired to develop a system and method for easily and rapidly removing and/or replacing media movers within an automated media library. 
     SUMMARY 
     The present invention is directed toward a mover replacement system for quickly and easily removing a media mover from within a media library. The media library includes a library housing. The media mover is movable between an operating position and a removable position. In various embodiments, the mover replacement system includes a service tray and a capture assembly. The service tray is removably positionable within the library housing. The service tray includes a tray body. The capture assembly is configured to enable the service tray to securely receive and releasably retain the media mover when the media mover is in the removable position. The capture assembly includes at least one locking mechanism that is movable relative to the tray body between a retracted position when the at least one locking mechanism is positioned not to engage the media mover, and a fully extended position when the at least one locking mechanism is positioned to retain the media mover relative to the tray body when the media mover is in the removable position so that the service tray and the media mover are movable as an integral unit out of and into the library housing. 
     In some embodiments, the capture assembly further includes a first sensor that is positioned adjacent to the at least one locking mechanism, the first sensor being configured to sense a position of the media mover relative to the at least one locking mechanism. 
     In certain embodiments, the capture assembly further includes a mover assembly that selectively moves the at least one locking mechanism between the retracted position and the fully extended position. The mover assembly includes a motor shaft, a motor that selectively rotates the motor shaft, and a mechanism engager that engages an engaged surface of the at least one locking mechanism. In such embodiments, rotation of the motor shaft rotates the mechanism engager to move the at least one locking mechanism between the retracted position and the fully extended position. In some such embodiments, the capture assembly can further include a sensor assembly including a first sensor that senses the rotation of the motor shaft as the at least one locking mechanism is being moved between the retracted position and the fully extended position. 
     In some embodiments, the tray body defines a tray opening, and the media mover is releasably retained within the tray opening. 
     In certain such embodiments, the at least one locking mechanism includes a first extension arm and a second extension arm; wherein when the at least one locking mechanism is in the retracted position, neither the first extension arm nor the second extension arm extend into the tray opening; and wherein when the at least one locking mechanism is in the fully extended position, both the first extension arm and the second extension arm extend into the tray opening. 
     In some such embodiments, the at least one locking mechanism is further movable relative to the tray body to a partially extended position wherein the first extension arm extends into the tray opening but the second extension arm does not extend into the tray opening. 
     In certain embodiments, the mover replacement system further includes a plurality of guide rails that are coupled to the library housing, the guide rails being configured to guide the movement of the service tray into and out of the library housing. 
     In some embodiments, the library housing includes an insert cavity that is configured to receive the service tray. 
     In certain embodiments, the mover replacement system further includes an alignment assembly that is configured to ensure that the service tray is properly aligned within the library housing, the alignment assembly including a plurality of first alignment members that are coupled to the library housing, and a plurality of second alignment members that are coupled to the service tray. In such embodiments, each of the plurality of second alignment members is configured to engage one of the plurality of first alignment members as the service tray is positioned within the library housing. 
     The present invention is also directed toward a media library including a media mover and the mover replacement system as described above. 
     Additionally, the present invention is further directed toward a mover replacement system for removing a media mover from a media library, the media library including a library housing, the media mover being movable between an operating position and a removable position, the mover replacement system including a service tray that is removably positionable within the library housing, the service tray being configured to releasably retain the media mover when the media mover is in the removable position so that the service tray and the media mover are movable as an integral unit out of and into the library housing; and an alignment assembly that is configured to ensure that the service tray is properly aligned within the library housing, the alignment assembly including a plurality of first alignment members that are coupled to the library housing, and a plurality of second alignment members that are coupled to the service tray; wherein each of the plurality of second alignment members is configured to engage one of the plurality of first alignment members as the service tray is positioned within the library housing; and wherein each of the plurality of second alignment members is configured not to engage one of the plurality of first alignment members when the service tray has been removed from within the library housing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The novel features of this invention, as well as the invention itself, both as to its structure and its operation, will be best understood from the accompanying drawings, taken in conjunction with the accompanying description, in which similar reference characters refer to similar parts, and in which: 
         FIG.  1    is a simplified schematic top view illustration of an embodiment of an automated media library having features of the present invention, the automated media library including a media mover and a mover replacement system having a service tray; 
         FIG.  2 A  is a front perspective view illustration of another embodiment of the automated media library, the automated media library including a service module; 
         FIG.  2 B  is a partially exploded, rear perspective view illustration of the automated media library illustrated in  FIG.  2 A ; 
         FIG.  3    is a perspective view illustration of a portion of the service module illustrated in  FIG.  2 A ; 
         FIG.  4    is a perspective view illustration of an embodiment of the service tray that can be included within the service module illustrated in  FIG.  2 A , and an embodiment of the media mover that is retained within the service tray; 
         FIG.  5 A  is a top perspective view illustration of the service tray illustrated in  FIG.  4   ; 
         FIG.  5 B  is another top perspective view illustration of the service tray illustrated in  FIG.  4   ; 
         FIG.  5 C  is still another top perspective view illustration of the service tray illustrated in  FIG.  4   ; 
         FIG.  5 D  is a bottom perspective view illustration of the service tray illustrated in  FIG.  4   ; 
         FIG.  6 A  is a simplified schematic illustration of a portion of the service module illustrated in  FIG.  2 A , the service module including at least one locking mechanism that is in a retracted position; 
         FIG.  6 B  is a simplified schematic view illustration of the portion of the service module illustrated in  FIG.  6 A , the at least one locking mechanism being in a partially extended position; and 
         FIG.  6 C  is a simplified schematic view illustration of the portion of the service module illustrated in  FIG.  6 A , the at least one locking mechanism being in a fully extended position. 
     
    
    
     DESCRIPTION 
     Embodiments of the present invention are described herein in the context of a mover replacement system (sometimes also referred to herein as a “replacement system”) and method for removing and/or replacing a media storage mover assembly (or “media mover”) from within an automated media library (sometimes also referred to herein as a “media library”). More specifically, as provided in detail herein, the replacement system of the present invention enables an operator to quickly and easily remove and/or replace the media mover from within the media library as necessary, without partial disassembly of the media library or elaborate procedures, and without the need to disconnect or cut any cables in order to effectuate the removal and/or replacement process. 
     Those of ordinary skill in the art will realize that the following detailed description of the present invention is illustrative only and is not intended to be in any way limiting. Other embodiments of the present invention will readily suggest themselves to such skilled persons having the benefit of this disclosure. Reference will now be made in detail to implementations of the present invention as illustrated in the accompanying drawings. The same or similar reference indicators will be used throughout the drawings and the following detailed description to refer to the same or like parts. 
     In the interest of clarity, not all of the routine features of the implementations described herein are shown and described. It will, of course, be appreciated that in the development of any such actual implementations, numerous implementation-specific decisions must be made in order to achieve the developer&#39;s specific goals, such as compliance with application-related and business-related constraints, and that these specific goals will vary from one implementation to another and from one developer to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of engineering for those of ordinary skill in the art having the benefit of this disclosure. 
       FIG.  1    is a simplified schematic top view illustration of a media library  10 , e.g., a tape library in certain embodiments, including a media drive system  12 , e.g., a tape drive system in certain embodiments, having features of the present invention. In  FIG.  1   , a top cover (not shown) has been omitted for clarity so that the interior of the media library  10  is visible. The design of the media library  10  can be varied as desired. In particular, the media library  10  can have any suitable design that is capable of storing a plurality of media cartridges. More specifically, it is noted that the media library  10  illustrated in  FIG.  1    is just one non-exclusive example of a media library  10  usable with the present invention, and no limitations are intended based on the specific type and/or size of the media library  10  shown in  FIG.  1   . Additionally, although the media library  10  shown and described relative to  FIG.  1    is specifically shown and/or described at times as a tape cartridge library or tape library, it is understood that the present invention is equally applicable for use with any other suitable types of libraries using other types of media cartridges, such as optical disks, magnetic disk drives, emulated or virtual media drives, etc., as non-exclusive examples. However, for ease of discussion,  FIG.  1    and certain other Figures herein are sometimes described using tape cartridges as the applicable media cartridges, although this is not intended to restrict or limit the present invention in this manner. 
     In various embodiments, as illustrated in  FIG.  1   , the media library  10  can include one or more of: (i) a library housing  14  that defines a library interior  16 , (ii) a plurality of storage slots  18  that are each configured to receive and selectively retain (and store) a media cartridge  20 , e.g., a tape cartridge in certain embodiments, (iii) a rack assembly  22  including one or more racks  23 , (iv) a media cartridge mover assembly  24  (also sometimes referred to herein as a “media mover”), (v) the media drive system  12  including one or more media drives  26 , e.g., tape drives in certain embodiments, (vi) a power supply  28 , (vii) a control system  30 , (viii) a graphical user interface  34  (illustrated in phantom, and also sometimes referred to herein as a “GUI”), and (ix) a mover replacement system  36  (illustrated in phantom, and sometimes also referred to herein simply as a “replacement system”). It is appreciated that in different embodiments, the media library  10  can include more components or fewer components than what is illustrated and described in relation to  FIG.  1   . For example, as provided herein, in certain embodiments, the media library  10  can further include a service module  238  (illustrated in  FIG.  2 A ) into which the mover replacement system  36  can be integrated. Additionally, or in the alternative, in some embodiments, the media library  10  can include more than one service module  238 , and a mover replacement system  36  can be integrated into each of the service modules  238 . 
     As an overview, the mover replacement system  36  enables a user or operator to quickly and easily remove and/or replace the media mover  24  from within the media library  24  when necessary or desired. More particularly, in various embodiments, the media mover  24  can be quickly and easily moved from an operating position into a removable position where the media mover  24  can be releasably retained within a service tray  42  (illustrated in phantom) of the mover replacement system  36 ; and the service tray  42 , with media mover  24  securely retained therein, can then be quickly and easily removed as an integral unit from within the library housing  14 , e.g., from within a service module housing  248  (illustrated in  FIG.  2 A , and also sometimes referred to simply as a “module housing”) that can be included as part of the service module  238  and/or the mover replacement system  236 . The media mover  24  can then be removed from the service tray  42  for purposes of maintenance, repair and/or replacement. A properly maintained, repaired and/or replaced media mover  24  can then be positioned and retained again in the service tray  42  (the same service tray  42  or another service tray  42 ) before the service tray  42  is inserted back into the module housing  248  of the service module  238 . The media mover  24  can then be released from the service tray  42  and moved back into the operating position to provide any necessary and desired functions of the media mover  24  within the media library  10 . Various features and components of the service module  238 , the replacement system  36 , and the service tray  42  will be described in greater detail herein below. 
     It is appreciated that the need or desire to remove and/or replace the media mover  24  from within the media library  10  can be identified in many different ways. For example, the need to remove and/or replace the media mover  24  can be identified simply from failure of the media mover  24  to operate as required. Additionally, the media mover  24  can be removed and/or replaced based on a scheduled maintenance or replacement of the media mover  24 . Further, removal and/or replacement of the media mover  24  can be recommended via cloud analytics, i.e. remote monitoring of the usage, condition and error trends of the media library  10  and/or the media mover  24  by a suitable system operator/administrator. Still further, the need or desire to remove and/or replace the media mover  24  from within the media library  10  can be identified in another suitable manner. 
     The library housing  14  is configured to retain various components of the media library  10 . For example, as shown in  FIG.  1   , the plurality of storage slots  18 , the rack(s)  23  of the rack assembly  22 , the media mover  24 , the one or more media drives  26  of the media drive system  12 , the power supply  28 , and the control system  30  can all be received and retained at least substantially, if not entirely, within the library interior  16  that is defined by the library housing  14 . Additionally, in various embodiments, the mover replacement system  36 , e.g., the service tray  42 , can be selectively and/or removably positioned within the library interior  16  that is defined by the library housing  14 . In some such embodiments, the mover replacement system  36 , e.g., the service tray  42 , can be selectively and/or removably positioned within the module housing  248  of the service module  238 . 
     Additionally, in certain embodiments, as illustrated in  FIG.  1   , the library housing  14  can be rigid and have a substantially rectangular-shaped cross-section. Alternatively, the library housing  14  can have another suitable shape or configuration. For example, the library housing  14  can have a substantially square-shaped or any other suitable shaped cross-section. Further, the library housing  14  may be constructed of any number of conventional materials such as, for example, those utilized in industry standard rack mount cabinets. 
     In the embodiment shown in  FIG.  1   , the plurality of storage slots  18  can be positioned within the library housing  14 , with the storage slots  18  being configured to receive and retain (and store) the media cartridge(s)  20 . More particularly, in various embodiments, each of the storage slots  18  is configured to receive and retain a single media cartridge  20 . It is noted that no media cartridges  20  are shown as being retained within the storage slots  18  in  FIG.  1    for clarity. In various embodiments, the media library  10  can include any suitable number of storage slots  18  that are aligned in any suitable manner, and/or the media library  10  can be designed to retain any suitable number of media cartridges  20 . Alternatively, the storage slots  18  can be arranged in a different manner than is illustrated and described relative to  FIG.  1   . 
     The rack assembly  22  and/or the one or more racks  23  are configured to support the media mover  24  during use of the media mover  24  within the media library  10 . The design and configuration of the rack assembly  22  can be varied to suit the specific requirements of the media library  10 . For example, in one non-exclusive embodiment, the rack assembly  22  can include four individual racks  23  that are spaced apart from one another. Additionally, in some embodiments, each rack  23  can be oriented in a generally vertical direction and can extend a height that is sufficient to enable the media mover  24  to effectively retrieve a media cartridge  20  from any of the plurality of storage slots  18 . Alternatively, the rack assembly  22  can include a different number of racks  23 . For example, in some non-exclusive alternative embodiments, the rack assembly  22  can include two racks  23 , three racks  23  or more than four racks  23  that can be spaced apart from one another. 
     The media mover  24 , when in the operating position, selectively, e.g., upon request of a user, retrieves and moves the media cartridge  20  as desired between the storage slots  18  and the media drives  26 . In particular, during use, upon receiving a signal from the control system  30  to access a certain media cartridge  20 , the media mover  24  can be manipulated to physically retrieve the requested media cartridge  20  from its associated storage slot  18  in the media library  10 . Subsequently, the media mover  24  moves the media cartridge  20  to an appropriate media drive  26 , and inserts the media cartridge  20  into a drive housing  40  of the media drive  26  so that the requested read/write operations can be performed. Upon completion of the requested read/write operations, the media mover  24  can then return the media cartridge  20  to an appropriate storage slot  18 . 
     Additionally, it is appreciated that although a single media mover  24  is illustrated in  FIG.  1   , the media library  10  can be designed to include more than one media mover  24 . For example, in one non-exclusive alternative embodiment, the media library  10  can include two media movers  24  to function in different portions of the media library  10  and/or to provide redundancy in the event that one of the media movers  24  fails. 
     The one or more media drives  26  are configured for reading and/or writing data with respect to the media cartridge  20 . The number of media drives  26  provided within the media library  10  can be varied to suit the specific requirements of the media library  10 . For example, in certain embodiments, the media library  10  can include three media drives  26  that are stacked substantially one on top of another (with limited spacing therebetween). Alternatively, the media library  10  can include greater than three or fewer than three media drives  26  and/or the media drives  26  can be positioned in a different manner relative to one another. Further, depending on the specific design of the media library  10 , the media drives  26  can be adapted for use with different types of media, such as tape cartridges, optical drives, hard disk drives, etc. 
     Further, in certain embodiments, the media library  10  can include more than a single media drive system  12  for purposes of providing the one or more media drives  26 . For example, in some embodiments, the media library  10  can include a plurality of media drive systems  12 , with each media drive system  12  including one or more individual media drives  26 . In one such embodiment, the media library  10  can include three individual media drive systems  12 , with each media drive system  12  including a single media drive  26 , to provide a total of three media drives  26  for the media library  10 . Alternatively, the media library  10  can include any desired number of media drive systems  12  and/or media drives  26 . 
     The power supply  28  provides electrical power in a well-known manner to the one or more media drives  26 , the media mover  24 , the control system  30 , the mover replacement system  36  and/or additional media libraries  10 . The power supply  28  can be interfaced with these components as well as with an external power source in a well- known manner using industry standard cabling and connections. Alternatively, the power supply  28  can be interfaced with these components in another manner. 
     The control system  30  provides the desired and necessary control for general functionality of the media library  10 . The control system  30  can have any suitable design, many of which are well-known in the industry. For example, in one embodiment, the control system  30  can include a standard driver interface unit for receiving digital commands and translating the commands into driving currents, such as step pulses for controlling stepper motors, and/or for controlling the mover replacement system  36 . Further, the control system  30  can include a standard programmable general purpose computer formed on a single plug-in card unit and can include a programmed microprocessor or microcontroller, memory, communication interface, control interface, connectors, etc. Alternatively, the control system  30  can have a different design and/or the control system  30  can be positioned within the media library  10  in a different position or manner than that illustrated in  FIG.  1   . 
     Further, as shown, the media library  10  can also include the GUI  34 , e.g., an interactive touchscreen display or another suitable graphical user interface, which allows the user to interact with and/or transmit requests or commands to the media library  10 . For example, the GUI  34  can allow the user to transmit requests for moving certain media cartridges  20 , i.e. with the media mover  24 , between the storage slots  18  and the media drives  26 . Additionally, the GUI  34  can further allow the user to transmit requests for removing and/or replacing the media mover  24 , i.e. through operation of the mover replacement system  36 . 
     The mover replacement system  36  is configured to enable the user to quickly and easily remove and replace the media mover  24  from within the library interior  16  of the library housing  14 , as desired. More specifically, as described in greater detail herein below, the mover replacement system  36  includes the service tray  42 , which is configured to selectively receive and releasably retain the media mover  24  when it is desired to move the media mover  24  out of or back into the library interior  16 . With such design, the service tray  42 , with the media mover  24  effectively retained thereon and/or secured thereto, can be quickly and easily removed from the library interior  16 , and/or inserted back into the library interior  16 . As such, the service tray  42  can be said to be selectively and/or removably positionable within the library housing  14 , e.g., within the module housing  248 . 
       FIG.  2 A  is a front perspective view illustration of another embodiment of the automated media library  210 . As illustrated, the media library  210  includes a standard library module  244  (also referred to herein simply as a “library module”), and a service module  238  that is operably and/or mechanically coupled to the library module  244 . Additionally, as shown, the media library  210  includes a library housing  214  that includes both a standard library housing  246  that is configured to retain various components included as part of the library module  244  of the media library  210 , and the module housing  248  that is configured to retain various components included as part of the service module  238  of the media library  210 . 
     In various embodiments, the library module  244  is configured to incorporate and/or include many of the components of the media library  210 , such as those that have been illustrated and described above in relation to the media library  10  illustrated in  FIG.  1   . For example, in certain embodiments, the plurality of storage slots  218 , the rack(s)  223  of the rack assembly  222 , the one or more media drives of the media drive system, the power supply, and the control system can all be received and retained at least substantially, if not entirely, within the standard library housing  246  of the library module  244 . Additionally,  FIG.  2 A  also illustrates the GUI  234  that can be accessible to the user from an outer surface of the standard library housing  246 . Further, the media mover  224  (illustrated in  FIG.  2 B ) can also often be received and retained within the standard library housing  246  during use of the media library  210 . However, as described in detail herein below, the media mover  224  is configured to move between the library module  244  and the service module  238  depending upon the intended use of the media library  210  at any given time. Stated in another manner, during use of the media library  210 , the media mover  224  can be received and retained either within the standard library housing  246  or within the module housing  248  depending upon the intended use of the media library  210  at any given time. Still further, as provided herein, the media mover  224  will at least be moved so that it is received and retained within the module housing  248  of the service module  238  when it is desired to remove and/or replace the media mover  224  from within the library housing  214 , i.e. with the mover replacement system  236  (illustrated more clearly in  FIG.  2 B ). 
     As noted above, the service module  238  is operably and/or mechanically coupled to the library module  244 . More specifically, as shown in  FIG.  2 A , the service module  238  can be positioned substantially directly beneath and can be operably and/or mechanically coupled to the library module  244 . Alternatively, the service module  238  can be positioned in a different manner relative to the library module  244 , e.g., the service module  238  can be positioned substantially directly above the library module  244 . 
     As illustrated, the mechanical coupling between the service module  238  and the library module  244  can be accomplished through a mechanical coupling between the module housing  248  of the service module  238  and the standard library housing  246  of the library module  244 . It is appreciated that the mechanical coupling between the module housing  248  and the standard library housing  246  can be accomplished in any suitable manner. 
     Additionally,  FIG.  2 A  illustrates a pair of service module magazines  250  (also referred to herein simply as “module magazines”) that have been partially removed from the module housing  248  of the service module  238 . As provided herein, in some embodiments, the service module  238  can include a plurality of service module storage slots  352  (illustrated in  FIG.  3   , and also referred to herein as “module storage slots”) to provide additional storage opportunities for storing additional media cartridges  20  (illustrated in  FIG.  1   ) within the media library  210 . The module storage slots  352  can be incorporated within the module magazines  250 . 
       FIG.  2 B  is a partially exploded, rear perspective view illustration of the automated media library  210  illustrated in  FIG.  2 A .  FIG.  2 B  again illustrates that the media library  210  includes the library module  244  and the service module  238 , with the standard library housing  246  of the library module  244  mechanically coupled to the module housing  248  of the service module  238 . Additionally,  FIG.  2 B  also illustrates the service tray  242 , with the media mover  224  securely and releasably retained thereon, having been removed as an integral unit from an insert cavity  254  as defined by the module housing  248 . 
     Also shown in  FIG.  2 B , the replacement system  236  can include a pair of guide rails  256  (or “guides”, only one is clearly visible in  FIG.  2 B ) that are coupled to the module housing  248  and that are configured to guide the movement of the service tray  242  into and out of the insert cavity  254  of the module housing  248 . In some embodiments, the guides  256  are oversized guides that enable easier insertion and/or removal of the service tray  242  from the module housing  248 . Additionally, the oversized guides  256  can also be provided with a large lead-in ramp which can effectively minimize the amount of space required behind the media library  210  for removal and/or replacement of the media mover  224 . 
     It is appreciated that initiating removal and/or replacement of the media mover  224  can be accomplished in several ways. For example, removal and/or replacement of the media mover  224  can be initiated by requesting it over the network or via the GUI  234  (illustrated in  FIG.  2 A ). Additionally, or in the alternative, removal and/or replacement of the media mover  224  can be initiated by pressing and holding buttons on the front of the media library  210  or pressing a button at the rear of the media library  210 . Still alternatively, removal and/or replacement of the media mover  224  can be initiated in another suitable manner. 
     As described in detail herein, once any of these methods have been implemented to initiate removal and/or replacement of the media mover  224 , the media mover  224  will move to the service tray  242 , i.e. into the removable position. The service tray  242  will then capture and lock in place the media mover  224  and indicate its readiness to be removed via the network, local GUI  234  and/or illuminated features. Additionally, in the event of a power failure or if the media mover  224  cannot otherwise move itself into the service tray  242  in the desired automated manner, the media mover  224  can alternatively be manually moved into the removable position in the service tray  242  from the front of the media library  210 . In some embodiments, access to the media mover  224  and/or the replacement system  236  can be gained by an operator via removal or partial removal of the module magazines  250  (illustrated in  FIG.  2 A ) and/or removal or partial removal of magazines that include the storage slots  18  (illustrated in  FIG.  1   ) positioned within the standard library housing  246 . 
     Further, as illustrated in  FIG.  2 B , the replacement system  236  can further include a latch assembly  258  that can be positioned at the rear of the media library  210 . For example, when the service tray  242  and media mover  224  are ready for removal, the person servicing the media mover  224  simply needs to activate the latch assembly  258 . More particularly, as shown in  FIG.  2 B , the latch assembly  258  can include a retaining latch  258 A that is configured to selectively engage the module housing  248  so that the service tray  242  can be effectively retained within the module housing  248 , and a latch activator  258 B (or “latch rotator”) that is configured to selectively move the retaining latch  258 A between and engaged position (i.e. where the retaining latch  258 A engages the module housing  248 ) and a disengaged position (i.e. where the retaining latch  258 A no longer engages the module housing  248 ). For example, in one non-exclusive embodiment, the latch activator  258 B can be selectively rotated so that the retaining latch  258 A is moved between the engaged position and the disengaged position. Alternatively, the latch assembly  258  can have another suitable design. 
     Once the latch assembly  258 , i.e. the retaining latch  258 A, has been moved to the disengaged position, the operator can simply slide the service tray  242 , with the media mover  224  securely and releasably retained therein, out of the back of the service module  238 , i.e. out of the back of the module housing  248 . A new and/or maintained and repaired service tray  242  and media mover  224  can then be inserted back into the module housing  248  of the service module  238 , i.e. into the insert cavity  254  as defined by the module housing  248 . Once positioned back inside the module housing  248 , the latch activator  258 B can be used to move the retaining latch  258 A back to the engaged position, and the service tray  242  will again be securely retained in position within the module housing  248 . Generally speaking, the entire procedure can be accomplished in less than two minutes and does not require any elaborate steps or any cutting or disconnecting of any cables. 
       FIG.  3    is a perspective view illustration of a portion of the service module  238  illustrated in  FIG.  2 A . In particular,  FIG.  3    is a perspective view illustration of the module housing  248 , and various features and components that are included within the module housing  248 , with the service tray  242  (illustrated in  FIG.  2 B ) having been removed from within the insert cavity  254  as defined by the module housing  248 . For example, it is appreciated that  FIG.  3    again illustrates the guides  256  that are positioned within the module housing  248  for purposes of guiding the movement of the service tray  242  into and out of the module housing  248 . 
     Additionally, also shown in  FIG.  3    are the module storage slots  352  that can be included within the module magazines  250 . As noted above, the module storage slots  352  are utilized to provide additional storage opportunities for storing additional media cartridges  20  (illustrated in  FIG.  1   ) within the media library  210 . In particular, as with the storage slots  18  (illustrated in  FIG.  1   ) positioned within the standard library housing  246  (illustrated in  FIG.  2 A ), the module storage slots  352  positioned within the module housing  248  are configured to receive and retain (and store) the media cartridge(s)  20 . In various embodiments, each of the module storage slots  352  is configured to receive and retain a single media cartridge  20 . Additionally, the module housing  248  and the service module  238  can include any suitable number of module storage slots  352  that are aligned in any suitable manner, and/or the service module  238  can be designed to retain any suitable number of media cartridges  20 . Alternatively, the module storage slots  352  can be arranged in a different manner than is illustrated and described relative to  FIG.  3   . 
     Further, as illustrated in  FIG.  3   , the service module  238  can also include a module rack assembly  360  including one or more module racks  362  that are configured to support the media mover  224  (illustrated in  FIG.  2 B ) during use of the media mover  224  within the media library  210 . The design and configuration of the module rack assembly  360  can be varied to suit the specific requirements of the media library  210 . For example, in one non-exclusive embodiment, the module rack assembly  360  can include four individual module racks  362  that are spaced apart from one another. Additionally, in some embodiments, each module rack  362  can be oriented in a generally vertical direction and can extend a height that is sufficient to enable the media mover  224  to effectively retrieve a media cartridge  20  from any of the plurality of module storage slots  352 . Alternatively, the module rack assembly  360  can include a different number of module racks  362 . For example, in some non-exclusive alternative embodiments, the module rack assembly  360  can include two module racks  362 , three module racks  362  or more than four module racks  362  that can be spaced apart from one another. 
     It is appreciated that the module racks  362  of the module rack assembly  360  will be substantially aligned with the racks  23  (illustrated in  FIG.  1   ) of the rack assembly  22  (illustrated in  FIG.  1   ) so that the media mover  224  can smoothly move between the racks  23  and the module racks  362 . Additionally, it is further appreciated that in certain embodiments, the module racks  362  are spaced apart vertically from the racks  23  to allow for positioning of the service tray  242  (illustrated in  FIG.  2 B ) within the module housing  248  (illustrated in  FIG.  2 A ). As described in detail herein below, it is appreciated that in such embodiments the service tray  242  can include a tray rack assembly  464  (illustrated in  FIG.  4   ), i.e. including tray racks  466  (illustrated in  FIG.  4   ), that is positioned to be aligned vertically between the rack assembly  22  and the module rack assembly  360 . With such design, the media mover  224  will be able to move smoothly between the racks  23 , the tray racks  466  and the module racks  362 . Additionally, such design further enables the media mover  224  to effectively access any desired media cartridges  20  that are positioned within the storage slots  18  in the standard library housing  246  and/or within the module storage slots  352  positioned within the module housing  248 . Further, as described herein, the positioning of the media mover  224  along the tray racks  466  is desired when the media mover  224  is being captured by the service tray  242  for purposes of removal and/or replacement of the media mover  224  from within the media library  210 . 
     Also illustrated in  FIG.  3   , and included as part of the module housing  248 , is a portion of an alignment assembly  368  that is configured to ensure proper alignment of the service tray  242  within the module housing  248 . In some embodiments, as shown in  FIG.  3   , the alignment assembly  368  can include a plurality of first alignment members  370 , e.g., alignment pins, that are configured to engage a plurality of second alignment members  472  (illustrated in  FIG.  4   ), e.g., alignment apertures, as the service tray  242  is being positioned within the module housing  248 . More particularly, in such embodiments, during insertion of the service tray  242  into the module housing  248 , each of the alignment pins  370  is positioned to engage one of the alignment apertures  472  so that the service tray  242  has the proper vertical and lateral positioning within the module housing  248 . 
     In one embodiment, the alignment pins  370  can be secured to and/or included as part of the module housing  248 , and the alignment apertures  472  can be included as part of the service tray  242 . Alternatively, in another embodiment, the alignment pins  370  can be secured to and/or included as part of the service tray  242 , and the alignment apertures  472  can be included as part of the module housing  248 . Still alternatively, the alignment assembly  368  can have another suitable design for purposes of ensuring proper alignment of the service tray  242  within the module housing  248 . 
     The alignment assembly  368  can include any suitable number of alignment pins  370  and alignment apertures  472 . For example, in one non-exclusive alternative embodiment, the alignment assembly  368  can include four alignment pins  370 , and four alignment apertures  472 . Alternatively, the alignment assembly  368  can include greater than four or less than four alignment pins  370 , and greater than four or less than four alignment apertures  472 . 
       FIG.  4    is a perspective view illustration of the service tray  242  that can be included as part of the replacement system  236 , and the media mover  224  that is selectively and releasably retained within the service tray  242 . In particular,  FIG.  4    illustrates various features and components of the replacement system  236  that can be incorporated into the service tray  242  for purposes of quickly and easily capturing and securing the media mover  224 , and for purposes of quickly and easily moving the service tray  242  and media mover  224  as an integral unit into and out of the module housing  248  (illustrated in  FIG.  2 A ). 
     The design of the replacement system  236  can be varied. As illustrated in  FIG.  4   , in various embodiments, the replacement system  236  can include one or more of the service tray  242 , the alignment assembly  368 , the tray rack assembly  464 , the latch assembly  258 , and a capture assembly  474 . Additionally, or in the alternative, the replacement system  236  can include more components or fewer components than what are specifically illustrated in  FIG.  4   . Further, as described herein, it is appreciated that certain components of the replacement system  236  are incorporated into the module housing  248 , e.g., the guides  356  and portions of the alignment assembly  368 , and thus are not illustrated in  FIG.  4   . 
     As provided herein, the service tray  242  is configured to selectively receive and securely retain the media mover  224  when it is desired to remove and/or replace the media mover  224  from within the media library  210 . As shown in  FIG.  4   , the service tray  242  includes a tray body  442 A, and when the media mover  224  is securely retained by the service tray  242 , the media mover  224  is configured to remain substantially stationary relative to the tray body  442 A. More particularly, the tray body  442 A defines a tray opening  542 B (illustrated in  FIG.  5 A ), and the media mover  224  is configured to selectively fit and be securely retained within the tray opening  542 B as defined by the tray body  442 A. 
     With regard to the alignment assembly  368 ,  FIG.  4    illustrates the alignment apertures  472 , which help to ensure the proper alignment of the service tray  242  within the module housing  248  (illustrated in  FIG.  2 A ). More specifically,  FIG.  4    illustrates that the alignment assembly  368  can include four alignment apertures  472  that are configured to engage the alignment pins  370  that are secured to and/or included as part of the module housing  248 . As noted above, during insertion of the service tray  242  into the module housing  248 , each of the alignment pins  370  is positioned to engage one of the alignment apertures  472  so that the service tray  242  has the proper vertical and lateral positioning within the module housing  248 . The alignment pins  370  can have any suitable length and the alignment apertures  472  can have any suitable depth. For example, in one embodiment, the alignment pins  370  have a length of at least approximately one inch, and the alignment apertures  472  have a depth of at least approximately one inch. With such design, the alignment apertures  472  will engage the alignment pins  370  during the last approximately one inch of the seating process for positioning the service tray  242  within the module housing  248 . Alternatively, the length of the alignment pins  370  and the depth of the alignment apertures  472  can be greater than or less than the values specifically set forth herein above. 
     Additionally, as noted above, when the service tray  242  is accurately positioned within the module housing  248 , the tray rack assembly  464  is positioned to be aligned vertically between the rack assembly  22  (illustrated in  FIG.  1   ) and the module rack assembly  360  (illustrated in  FIG.  3   ). As further noted above, proper alignment is necessary so that the media mover  224  will be able to move smoothly between the racks  23  (illustrated in  FIG.  1   ), the tray racks  466  and the module racks  362  (illustrated in  FIG.  3   ). 
     It is appreciated that proper positioning of the racks  23 , the tray racks  466  and the module racks  362  relative to one another can be very critical to the design of the replacement system  236 . Thus, in some embodiments, the tray rack assembly  464  can further include a resilient member  476 , e.g., a spring, which is configured to effectively spring-load the tray rack assembly  464  to ensure such proper alignment as the service tray  242  is positioned within the module housing  248 . More particularly, the resilient member  476  enables reference surfaces to be spring-loaded against each other on the racks and in the chassis to make sure that the racks  23 , the tray racks  466  and the module racks  362  properly aligned relative to one another. In some embodiments, the resilient member  476  is configured and/or biased to position the service tray  242  a small distance, e.g., one to two inches, away from a fully seated position within the module housing  248 . As such, when the service tray  242  is being positioned within the module housing  248 , the service tray  242  must be forced against the bias of the resilient member  476  in the last one to two inches of the seating process. With such design, positional variation between the tray racks  466  and the module racks  362 , e.g., due to temperature variations, part tolerances, contamination, etc., can be effectively accommodated so that the desired alignment between the racks  23 , the tray racks  466  and the module racks  362  can be achieved. 
     The capture assembly  474  is configured to enable the service tray  242  to securely receive and releasably retain the media mover  224  when the media mover  224  has been moved to the removable position and it is desired to remove and/or replace the media mover  224  from within the media library  210 . The design of the capture assembly  474  can be varied to suit the requirements of the media library  210  and/or the replacement system  236  within which the capture assembly  474  is used. In various embodiments, the capture assembly  474  can include one or more of at least one locking mechanism  478 , a mover assembly  480  and a sensor assembly  582  (illustrated, for example, in  FIG.  5 B ). Additionally, or in the alternative, the capture assembly  474  can include more components or fewer components that what is illustrated and described herein. Further, in some embodiments, as shown in  FIG.  4   , the capture assembly  474  can also include a manual activator  483  and a manual mover  484  to enable manual capture of the media mover  224  by the service tray  242  in the event of power failure or if the capture system  474  otherwise fails to automatically secure the media mover  224  within the service tray  242 . 
     The at least one locking mechanism  478  is configured to move relative to the tray body  442 A so that the media mover  224  can be effectively secured and releasably retained within the service tray  242 . It is appreciated that the capture assembly  474  can include any suitable number of locking mechanisms  478 . For example, in one non- exclusive embodiment, the capture assembly  474  can include four locking mechanisms  478  that are spaced apart from one another, with two locking mechanisms  478  positioned along either side of the tray opening  542 B. Alternatively, the capture assembly  474  can include greater than four or fewer than four locking mechanisms  478 . 
     In certain embodiments, the at least one locking mechanism  478  is selectively moved relative to the tray body  442 A between a retracted position (illustrated in  FIG.  6 A ), a partially extended position (illustrated in  FIG.  6 B ), and a fully extended position (illustrated in  FIG.  6 C ). More specifically, jumping ahead briefly to  FIGS.  6 A- 6 C ,  FIG.  6 A  is a simplified schematic illustration of a portion of the service module  238  illustrated in  FIG.  2 A , the service module  238  including at least one locking mechanism  478  that is in a retracted position;  FIG.  6 B  is a simplified schematic view illustration of the portion of the service module  238  illustrated in  FIG.  6 A , the at least one locking mechanism  478  being in a partially extended position; and  FIG.  6 C  is a simplified schematic view illustration of the portion of the service module  238  illustrated in  FIG.  6 A , the at least one locking mechanism  478  being in a fully extended position. 
     As shown in  FIG.  6 A , the at least one locking mechanism  478  includes a first extension arm  678 A and a spaced apart second extension arm  678 B. As described herein, it is appreciated that the spacing between the first extension arm  678 A and the second extension arm  678 B is approximately equal to a thickness of the portion of the media mover  224  that is directly captured between the first extension arm  678 A and the second extension arm  678 B. It is appreciated that the at least one locking mechanism  478  can have another suitable design for purposes of securely retaining the media mover  224  within the service tray  242 . 
     When the at least one locking mechanism  478  is in the retracted position, such as shown in  FIG.  6 A , no part of the locking mechanism  478  extends into the tray opening  542 B as defined by the tray body  442 A of the service tray  242 . Thus, when the locking mechanism  478  is in the retracted position, the media mover  224  can move fully into and through the tray opening  542 B so that the media mover  224  can effectively access the media cartridges  20  (illustrated in  FIG.  1   ) in any of the storage slots  18  (illustrated in  FIG.  1   ) and/or in any of the module storage slots  352  (illustrated in  FIG.  3   ). 
     As noted,  FIG.  6 B  shows the locking mechanism  478  having been moved relative to the tray body  442 A, i.e. with the mover assembly  480  (illustrated in  FIG.  4   ) and/or the manual mover  484  (illustrated in  FIG.  4   ), to the partially extended position. More particularly, when the at least one locking mechanism  478  is in the partially extended position, the first extension arm  678 A extends into the tray opening  542 B as defined by the tray body  442 A of the service tray  242 , but the second extension arm  678 B does not extend into the tray opening  542 B. Thus, when the locking mechanism  478  is in the partially extended position, the media mover  224  can be positioned directly adjacent to the first extension arm  678 A, e.g., can rest directly on top of the first extension arm  678 A. At such time, it can be said that the media mover  224  has been received within the service tray  242 , and the media mover  224  is inhibited from moving any further through the tray opening  542 B. 
     Additionally, as noted above,  FIG.  6 C  illustrates the locking mechanism  478  having been moved relative to the tray body  442 A, i.e. with the mover assembly  480  (illustrated in  FIG.  4   ) and/or the manual mover  484  (illustrated in  FIG.  4   ), to the fully extended position. More particularly, when the at least one locking mechanism  478  is in the fully extended position, the first extension arm  678 A extends to a larger extent into the tray opening  542 B as defined by the tray body  442 A of the service tray  242 , and the second extension arm  678 B extends to a lesser extent into the tray opening  542 B. Thus, when the locking mechanism  478  is in the fully extended position, a portion of the media mover  224  can be positioned substantially directly adjacent to and between the first extension arm  678 A and the second extension arm  678 B. At such time, it can be said that the media mover  224  has been securely retained within the service tray  242 , and the media mover  224  is inhibited from moving in either direction through the tray opening  542 B. 
     Returning back to  FIG.  4   , the mover assembly  480  is illustrated which can be utilized for purposes of automatically moving the at least one locking mechanism  478  between the retracted position, the partially extended position and the fully extended position. The mover assembly  480  can have any suitable design for purposes of moving the locking mechanism  478  between such positions. As illustrated in  FIG.  4   , the mover assembly  480  can include a motor  480 A, a motor shaft  480 B and a mechanism engager  480 C. Alternatively, the mover assembly  480  can have another suitable design. 
     In the embodiment illustrated in  FIG.  4   , the motor  480 A is configured to rotate the motor shaft  480 B. Additionally, as shown, the mechanism engager  480 C, e.g., a gear, is mounted on the motor shaft  480 B. Thus, the motor  480 A rotating the motor shaft  480 B also rotates the mechanism engager  480 C. Further, as illustrated, the locking mechanism  478  includes an engaged surface  478 C, e.g., teeth, that is engaged by the mechanism engager  480 C. Accordingly, as the motor  480 A rotates the motor shaft  480 B and thus the mechanism engager  480 C, the mechanism engager  480 C engages the engaged surface  478 C of the locking mechanism  478  so that the locking mechanism  478  is moved between the retracted position, the partially extended position and the fully extended position. 
     The sensor assembly  582  is configured to sense, e.g., directly sense, the movement and/or rotation of the motor shaft, and, thus, to sense, e.g., indirectly sense, the movement of the locking mechanism  478  between the retracted position, the partially extended position and the fully extended position. Additionally, the sensor assembly  582  is further configured to sense the position, or proximity, of the media mover  224  relative to the tray body  442 A and/or the locking mechanisms  478 . The design and functioning of the sensor assembly  582  will be described in greater detail herein below. 
     As noted above, in some embodiments, the capture assembly  474  can also include the manual activator  483  and the manual mover  484  to enable manual capture of the media mover  224  by the service tray  242  in the event of power failure or if the capture system  474  otherwise fails to automatically secure the media mover  224  within the service tray  242 . The manual activator  483  and the manual mover  484  can have any suitable design. In one embodiment, the manual activator  483  can be provided in the form of a plunger that when depressed operatively disengages the motor  480 A from the motor shaft  480 B, thus enabling the manual rotation of the motor shaft  480 C. Additionally, in one embodiment, the manual mover  484  can be provided in the form of a rotating knob that is coupled to the motor shaft  480 C, such that rotation of the knob  484  results in a corresponding rotation of the motor shaft  480 B. It is further appreciated that, as with the automated process, rotation of the motor shaft  480 B thus rotates the mechanism engager  480 C, which in turn engages the engaged surface  478 C of the locking mechanism  478  and moves the locking mechanism  478  between the retracted position, the partially extended position and the fully extended position. As referred to herein, such components as utilized for purposes of manually capturing the media mover  224  within the service tray  242  can sometimes be referred to as a “manual capture assembly”. 
       FIGS.  5 A- 5 D  illustrate additional views of the service tray  242 , without the media mover  224  secured thereto, to better and more effectively illustrate certain features and components of the replacement system  236 . 
       FIG.  5 A  is a top perspective view illustration of the service tray  242  illustrated in  FIG.  4    that can be included as part of the replacement system  236 . In particular,  FIG.  5 A  again illustrates various features and components of the service tray  242  and/or the replacement system  236  that were illustrated and described above in relation to  FIG.  4   . For example,  FIG.  5 A  again illustrates that the service tray  242  includes the tray body  442 A that defines the tray opening  542 B into which the media mover  224  (illustrated in  FIG.  2 B ) is selectively received and retained. Additionally,  FIG.  5 A  further illustrates that the service tray  242  and/or the replacement system  236  can include a portion of the alignment assembly  368  (e.g., the alignment apertures  472 )), the tray rack assembly  464  including one or more tray racks  466 , the latch assembly  258  (including the retaining latch  258 A), and the capture assembly  474 . Further, with respect to the capture assembly  474 ,  FIG.  5 A  more clearly illustrates four locking mechanisms  478  (shown in  FIG.  5 A  in the fully extended position), the mover assembly  480  (including the motor  480 A, the motor shaft  480 B and the mechanism engager  480 C), and the manual activator  483  and the manual mover  484  of the manual capture assembly. 
     Further,  FIG.  5 A  also illustrates certain additional components that can be included as part of the service module  238  and/or the replacement system  236 . For example,  FIG.  5 A  further illustrates a docking card  586  that can be coupled to the service tray  242  to enable electrical conductivity and sensor control. More particularly, the docking card  586  can include a card extension tab  586 A that is configured to engage a backplane in the media library  210  which provides electrical connectivity and sensor control. The engagement between the docking card  586 , i.e. the card extension tab  586 A, and the backplane in the media library  210  can occur during the final precise alignment of the service tray  242 , as the service tray  242  with the media mover  224  secured thereto is positioned back into the module housing  248  of the service module  238 . 
       FIG.  5 B  is another top perspective view illustration of the service tray  242  illustrated in  FIG.  4   . More particularly,  FIG.  5 B  again illustrates various features and components of the service tray  242  and/or the replacement system  236  that were illustrated and described above; and further illustrates certain features and components that were not clearly visible in previous Figures. 
     For example,  FIG.  5 B  again illustrates the tray rack assembly  464  including one or more tray racks  466 , the latch assembly  258  (including the retaining latch  258 A and the latch activator  258 B), the docking card  586 , and various portions of the capture assembly  474 . More specifically,  FIG.  5 B  illustrates certain features of the sensor assembly  582  that were not clearly visible in any previous Figures. 
     As shown in  FIG.  5 B , the sensor assembly  582  can include one or more first sensors  588 , e.g., Hall effect sensors, which are configured to sense the rotation of the motor shaft  480 B, and thus the position of the locking mechanisms  478 . In some embodiments, a pair of sensed members  590 , e.g., paddles, each with a magnet mounted therein or secured thereto, can be mounted on each motor shaft  480 B (i.e. on either side of the service tray  242 ), which are spaced apart from one another laterally along the motor shaft  480 B as well as rotationally about the motor shaft  480 B. In one such embodiment, the paddles  590  can be spaced apart approximately sixty degrees from one another about the motor shaft  480 B. Alternatively, the paddles  590  can be spaced apart greater or less than sixty degrees about the motor shaft  480 B. As illustrated, a first, first sensor  588  can be positioned to sense a rotation of a first paddle  590 , and a second, first sensor  588  can be positioned to sense a rotation of a second paddle  590 . In such embodiment, when the first, first sensor  588  senses a maximum or strongest signal from the first paddle  590  during rotation of the motor shaft  480 B, such strong signal is indicative of the locking mechanism  478  having been moved to the partially extended position. Additionally, in such embodiment, when the second, first sensor  588  senses a maximum or strongest signal from the second paddle  590  during rotation of the motor shaft  480 B, such strong signal is indicative of the locking mechanism  478  having been moved to the fully extended position. Thus, the one or more first sensors  588  are able to effectively sense the rotational position of the motor shaft  480 B and thus the position of the locking mechanisms  478 . Alternatively, the sensor assembly  582  and/or the first sensors  588  can have a different design for purposes of sensing the rotational position of the motor shaft  480 B and thus the position of the locking mechanisms  478 . 
     Additionally, as shown in  FIG.  5 B , the service tray  242  can further include an electrostatic discharge (ESD) shielding  587  that is provided to protect the users and operators of the media library  210  by keeping ESD generated by operation of various features of the media library  210  within the media library  210 . It is appreciated that the ESD shielding  587  can have any suitable design. 
       FIG.  5 C  is still another top perspective view illustration of the service tray  242  illustrated in  FIG.  4   . In particular,  FIG.  5 C  again illustrates various features and components of the service tray  242  and/or the replacement system  236  that were illustrated and described above; and further illustrates certain features and components that were not clearly visible in previous Figures. For example,  FIG.  5 C  again illustrates the tray rack assembly  464  including one or more tray racks  466 , the latch assembly  258  (including the retaining latch  258 A), the docking card  586 , and various portions of the capture assembly  474 . 
     Additionally,  FIG.  5 C  further illustrates a power and communications source  592 , e.g., a power and communications spool, that is coupled to the service tray  242  to provide power and communications to the media mover  224  (illustrated in  FIG.  2 B ). More specifically, in this embodiment, the power and communications source  592  is electrically coupled to the docking card  586 , and an engagement tab  594 , which is positioned to selectively engage the media mover  224 . It is appreciated that the power and communications source  592  can have any suitable design for purposes of providing the desired power and communications capabilities to the media mover  224 . 
       FIG.  5 D  is a bottom perspective view illustration of the service tray  242  illustrated in  FIG.  4   . In particular,  FIG.  5 D  again illustrates various features and components of the service tray  242  and/or the replacement system  236  that were illustrated and described above; and further illustrates certain features and components that were not clearly visible in previous Figures. 
     For example,  FIG.  5 D  again illustrates the tray rack assembly  464  including one or more tray racks  466 , the docking card  586 , and various portions of the capture assembly  474 . However,  FIG.  5 D  further illustrates certain features of the sensor assembly  582  that were not clearly visible in any previous Figures. 
     As shown in  FIG.  5 D , the sensor assembly  582  can further include one or more second sensors  596 , with one second sensor  596  being coupled to each of the locking mechanisms  478 . In certain embodiments, the second sensors  596  are proximity sensors that are configured to sense the proximity of certain components, i.e. the media mover  224  (illustrated in  FIG.  2 B ) in this instance, to the sensor  596  and thus the proximity to the locking mechanisms  478 . More specifically, the second sensors  596  are configured to sense when the media mover  224  is sufficiently close to the corresponding locking mechanism  478  such that the media mover  224  is in position to be effectively captured by the locking mechanism  478 . The second sensors  596  can have any suitable design for purposes of accurately sensing the proximity of the media mover  224 . 
     As described in detail herein, the one or more first sensors  588  (illustrated in  FIG.  5 B ) and the one or more second sensors  596  operate in conjunction with one another to recognize when the media mover  224  is in position to be captured, and then to ensure that the locking mechanisms  478  are moved appropriately to execute the desired capture of the media mover  224 . It is appreciated that the reference to the one or more first sensors  588  and the one or more second sensors  596  is merely for convenience and ease of discussion, and either sensors  588 ,  596  can be referred to as “first sensors” or “second sensors” 
     As provided herein, the method or procedure for positioning the service tray  242 , with the media mover  224  securely retained therein, into the module housing  248  (illustrated in  FIG.  2 A ) of the service module  238  includes the following general steps: 
     1) The service tray  242  is initially slid into an oversized slot, i.e. the insert cavity  254  (illustrated in  FIG.  2 B ), as defined by the module housing  248  permitting easy insertion into the media library  210 ; 
     2) Approximately one inch before being fully seated within the module housing  248 , the service tray  242  engages four alignment pins  370  on the module housing  248  which precisely locate the service tray  242  within the module housing  248 ; 
     3) During this final precise alignment, a docking card  586  engages a backplane in the media library  210  which provides electrical connectivity and sensor control; 
     4) Due to the length of the service tray  242 , spring-loaded features, e.g., resilient member(s)  476 , are employed to guarantee accurate placement of the tray rack assembly  464  to ensure smooth movement of the media mover  224  between the rack assembly  22  (illustrated in  FIG.  1   ) of the standard library housing  246  (illustrated in  FIG.  2 A ), the tray rack assembly  464 , and the module rack assembly  360  of the module housing  248 . 
     Additionally, as provided herein, it is appreciated that the removal and/or replacement of the media mover  224 , i.e. via the replacement system  236 , can be accomplished via an automated removal process or via a manual removal process. The basic details of such alternative processes, as described in detail above, will be summarized below. 
     During an automated removal process, the following general steps will occur: 
     1) After requesting removal of the media mover  224 , the media mover  224  will position itself adjacent to locking mechanisms  478  (or “catches”) in the service tray  242 ; 
     2) These locking mechanisms  478  have sensors  596 , i.e. proximity sensors, which confirm that the media mover  224  is correctly located for capture; 
     3) Motors  480 A then drive the locking mechanisms  478  into the proper capture position, i.e. the fully extended position, with the capture position being monitored by magnetic sensors  588 , e.g., Hall effect sensors; 
     4) Successful capture of the media mover  224  by the locking mechanisms  478  is then indicated via the network, GUI and LEDs; 
     5) The service tray  242  and media mover  224  can now be removed as an integral unit and replaced; 
     6) New and/or maintained or repaired service tray  242  and media mover  224  can now be reinserted back into the module housing  248  in a manner as described above; and 
     7) Once replaced, the media mover  224  will automatically reinitialize to be prepared for proper functionality within the media library  210 . 
     Alternatively, during a manual removal process, the following general steps will occur: 
     1) After requesting removal of the media mover  224 , failure of the media mover  224  to automatically move to the service tray  242  will result in flashing yellow lights indicating that manual removal is required; 
     2) Manual removal requires pushing the media mover  224  from the front of the media library into the service tray  242 —access to the media mover  224  and the service tray  242  can be gained via partial or full removal of the module magazines  250 ; 
     3) The manual operator can then depress the manual activator  483 , e.g., the plunger, and rotate the manual mover  484 , e.g., manual rotator, to move the locking mechanisms  478  into the proper capture position; 
     4) The service tray  242  and media mover  224  can now be removed and replaced; 
     5) New and/or maintained or repaired service tray  242  and media mover  224  can now be reinserted back into the module housing  248  in a manner as described above; and 
     6) Once replaced, the media mover  224  will automatically reinitialize to be prepared for proper functionality within the media library  210 . 
     Additionally, as provided herein, the unique mover replacement system  236  and method for rapid replacement of the media mover  224  from within the media library  210  provides various features and advantages. More particularly, the replacement system  236  and method as described herein at least provides the following features: 
     1) The service tray  242  can be used for shipping; 
     2) The service tray  242  contains power and communications cables  592 ; 
     3) The service tray  242  is ESD shielded; 
     4) The service tray  242  can be returned and tested for repair, servicing and failure analysis; 
     5) The service tray protects the media mover  224  from contact or damage during handling/replacement; 
     6) The service tray  242  and/or service module  238  can be located anywhere in a stacked media library system  210 ; 
     7) The pass-through design allows for ergonomic positioning; 
     8) The service tray  242  senses correct positioning of the media mover  224  in the service tray  242  prior to removal; 
     9) The service tray  242  automatically captures the media mover  224 ; 
     10) The service tray  242  further allows for manual replacement of the media mover  224  in the event of power failure or if the media mover  224  otherwise does not properly move to the service tray  242 ; 
     11) The service tray  242  allows for automatic replacement of the media mover  224  in less than two minutes; 
     12) The service tray  242  has precision alignment features—e.g., alignment apertures  472 —to assure proper alignment of the service tray  242  within the module housing  248 ; 
     13) The module housing  248  of the service module  238  of the media library  210  has matching alignment features, e.g., alignment pins  370  to precisely locate the service tray  242  within the module housing  248 ; 
     14) The media library  210  can use “cloud analytics” to determine whether the media mover  224  needs to be replaced; 
     15) The module housing  248  of the service module  238  of the media library  210  has oversized guides  256  for easy insertion of the service tray  242 —e.g., the module housing  248  has oversized guides  256  with a large lead-in ramp minimizing the amount of room required for replacement behind the media library  210 ; and 
     16) The media library  210  optimizes data storage by providing cartridge storage, e.g., via the module storage slots  352  in the module magazines  250 , nested underneath the service tray  242 . 
     It is understood that although a number of different embodiments of the mover replacement system  236  have been illustrated and described herein, one or more features of any one embodiment can be combined with one or more features of one or more of the other embodiments, provided that such combination satisfies the intent of the present invention. 
     While a number of exemplary aspects and embodiments of the mover replacement system  236  have been discussed above, those of skill in the art will recognize certain modifications, permutations, additions and sub-combinations thereof. It is therefore intended that the following appended claims and claims hereafter introduced are interpreted to include all such modifications, permutations, additions and sub- combinations as are within their true spirit and scope.