Source: https://patents.google.com/patent/US7982999?oq=7255627
Timestamp: 2018-02-21 16:30:17
Document Index: 293844543

Matched Legal Cases: ['art 2', 'art 1', 'art 1', 'art 2', 'art 2', 'Application No. 06007452', 'art 4']

US7982999B2 - Information storing device and method for controlling same to record/reproduce information by selecting one of working modes - Google Patents
US7982999B2
US7982999B2 US11050699 US5069905A US7982999B2 US 7982999 B2 US7982999 B2 US 7982999B2 US 11050699 US11050699 US 11050699 US 5069905 A US5069905 A US 5069905A US 7982999 B2 US7982999 B2 US 7982999B2
US11050699
US20050146806A1 (en )
This is a continuation of application Ser. No. 10/406,007 now U.S. Pat. No. 6,865,048 filed Apr. 3, 2003, which is a continuation of application Ser. No. 10/230,990 filed Aug. 30, 2002 now U.S. Pat. No. 6,563,658, which is a continuation of application Ser. No. 10/106,182 filed Mar. 27, 2002 now U.S. Pat. No. 6,476,994, which is a continuation of application Ser. No. 09/694,300 filed Oct. 24, 2000 now U.S. Pat. No. 6,381,087, which is a continuation of application Ser. No. 09/408,167 filed Sep. 29, 1999, now U.S. Pat. No. 6,151,182, which is a continuation of application Ser. No. 08/931,071 filed Sep. 15, 1997 now U.S. Pat. No. 5,982,570, which is a continuation of application Ser. No. 08/469,121 filed Jun. 6, 1995 now abandoned.
However, in a disk device in general, frequency with which the state where write/read is not effected is produced is not necessarily so high. Further, since the state where write/read is not effected is one where power consumption is smallest next to the not working state (power consumption being 0 W) where power is not switched on (power consumption is greatest at start of the motor and next greatest at file access, in either case power consumption being greater than that required when read/write is not effected while rotating the motor), as indicated in a cited reference, even if the disk motor speed is reduced by setting a waiting mode in this state where read/write is not effected, no effect to reduce remarkably power consumption can be obtained as a whole. On the contrary, considerable power is consumed temporarily, because it is required to increase the rotation speed of the disk motor upto a predetermined value, when it proceeds from this waiting mode to a write/read operation, if the read/write state is interrupted in this waiting mode. Furthermore, since a certain period of time is required for increasing the rotation speed of the motor upto the predetermined value when it proceeds from this waiting mode to the write/read operation, this gives rise to a problem that start of the write/read operation is retarded, which lowers working speed.
Recently an MR head is used, which produces reading voltage on the basis of the magneto-resistance effect. The MR head has a feature that it produces reading voltage without variations in magnetic field intensity due to relative movement of the magnetic head to a magnetic-recording face. Further for the magnetic head of hard disk drive, a floating method is usually used, utilizing a hydromechanical effect acting between the head slider and the disk surface. In addition, recently a contact method called contact recording is used, by which the head slider, on which the magnetic head is mounted, is not floated.
In order to satisfy the requirements defined by {circle around (1)}, it is necessary to increase the read/write speed of the disk, i.e. the rotation speed and the seek speed of the head. On the contrary, in order to satisfy the requirements defined by {circle around (2)}, it is necessary to decrease the read/write speed of the disk (rotation speed) and the seek speed of the head. These two properties are contradictory to each other and there exists heretofore no disk device satisfying these two properties at the same time, but there are different models of devices, each of which has one kind of the data read/write speed and the seek speed. For this reason every user cannot help preparing at least one model of devices satisfying each of the two properties and selecting a magnetic disk device having properties suitable for utilization conditions (whether it is used under restriction on noise level and maximum power, whether the transfer•access speed is regarded as important, etc.) for every use.
{circumflex over (2)} there is no way other than buying another or replacement by another, when it is desired to exchange a property of a magnetic disk device with another in the course of utilization because of change in utilization conditions; and
{circumflex over (3)} it is impossible to switch over the properties timely according to way of utilization.
An effect can be obtained such that it is possible to effect driving and control of the information storing device suitable for power supply capacity of the device of higher rank. Consequently, in case where the incorporated power source is a battery, an effect can be obtained such that it is possible to lengthen utilization time of the battery.
FIG. 15 is a block diagram of a disk device having a working mode turning over switch according to the present invention;
FIG. 1 is a perspective view of a disk device which is an embodiment of the present invention. Explanation will be made taking a mountable/dismountable magnetic disk device as an example of the disk device of course, the present invention can be applied to a fixed type disk device. Outer sizes of the whole disk device 101 are: width W=54 mm, depth D=85.6 mm and height E=10.5 mm. Outer sizes of a card-shaped portion 102 are: width W=54 mm, depth D=85.6 mm and height H=3.3 mm. A connector portion 103 is composed of 68 pins, including power lines and data command lines. These are consistent with Type 3 of the IC memory card specification for personal computer standardized according to PCMCIA/JEIDA.
In the disk device initialization is effected (Step 51) after start of power supply from the battery incorporating information processing device, which is the device of higher rank thereof. Thereafter it transmits the information on maximum currents Imax required in the different working modes to the device of, higher rank in a predetermined order. In the present embodiment it is transmitted in an order of 1.5 A, 0.9 A and 0.6 A, i.e. with decreasing maximum current. Therefore information of 1.5 A is offered at first (Step 52). Then it waits for a start command from the device of higher rank allowing an operation in the 1.5 A working mode for a predetermined time (Step 53). When the start command has been received, the 1.5 A working mode is set (Step 54) to start the spindle motor (Step 61) and to effect an initial seek operation (Step 62). When the start has been terminated, this is reported (Step 63) and it waits for read/write and other commands of higher rank (Step 64). One of the other commands of higher rank is e.g. a command of changing the working mode. When this command has been received, the procedure returns to Step 51 to set a new working mode. If it receives a command of read/write, it executes that command (Step 65) and the procedure returns to Step 64 to wait for a succeeding command.
FIG. 12 shows a starting procedure of a magnetic tape device. Content of the operation is basically identical to that indicated in FIG. 11. Operation steps having same contents are referred to by, same step numbers.
Two working modes are set within the CPU 86 one of which is a quick mode, in which the motor rotation speed is 7200 rpm and the seek moving time of the head is 8 ms, while the other is a silent mode, in which the motor rotation speed is 5400 rpm (current at starting being same as in quick mode) and the seek moving time of the head is 10 ms (acceleration and deceleration being same as in quick mode). The quick mode is a mode, in which a high speed transfer and a high speed access can be realized in the disk device, while the silent mode is a mode, in which a low power consumption and a low noise can be realized.
In FIG. 17, a disk device 1 comprises a disk 2 acting as recording medium; a motor 3 supporting rotatably the disk 2; a head 5 for reading/writing signals from in the disk 2; a head driving mechanism 6; a motor driving circuit 4 for driving the motor 3; and a head driving circuit 7 connected with the head driving mechanism 6. Both the driving circuits 4 and 7 are connected with the CPU 8 and ROM 8 b and RAM 8 c are connected with the CPU 8.
1. An operating method for a disk drive coupled to a higher rank device, the disk drive having
a disk-shaped memory medium,
a motor rotatably supporting the medium,
a motor driving circuit to drive the motor,
a read or write head,
a head driving mechanism to drive the head,
a head driving circuit coupled to the head driving mechanism, and
a microprocessor coupled to both the head driving circuit and the motor driving circuit, comprising:
transmitting a plurality of seek modes information of the disk drive to the higher rank device; and
wherein if a first seek mode is elected, then the head driving circuit supplies a first drive current to the head driving mechanism, if a second seek mode is selected, then the head driving circuit supplies a second drive current to the driving mechanism; and
wherein a noise level of the disk drive when the first seek mode is selected is greater than a noise level of the disk drive when the second seek mode is selected.
2. A disk device able to receive commands from a higher rank device comprising:
a motor driving circuit to drive said spindle motor;
a head for reading/writing signals from/to said magnetic disk;
a head driving mechanism coupled to said head; and
a head driving circuit coupled to said head driving mechanism,
wherein after said disk device is powered, a last seek mode among a plurality of seek modes is activated in said disk device,
wherein said plurality of seek modes includes a first seek mode and a second seek mode,
if said first seek mode is selected, said head driving circuit supplies a first drive current to said head driving mechanism,
if said second seek mode is selected, said head driving circuit supplies a second drive current to said head driving mechanism,
wherein said second drive current is smaller than said first drive current, and
a noise level of said disk device when said first seek mode is selected is greater than a noise level of said disk device when said second seek mode is selected.
3. The disk device according to claim 2, said last seek mode is a seek mode used before shutting off said disk device and is stored inside said disk device before said disk device is powered.
4. The disk device according to claim 3, wherein the first seek mode is a quick mode effecting short time seeking and the second seek mode is a silent mode effecting low noise seeking.
5. The disk device according to claim 2, wherein said last seek mode is set after a start command is received.
6. The disk device according to claim 5, further comprising:
wherein information of said last seek mode is stored on the surface of said magnetic disk.
7. The disk device according to claim 2, wherein an initialization is performed after said disk device is powered and before said last seek mode is activated.
8. The disk device according to claim 2, wherein said last seek mode is activated to be working for access to said disk device from said higher rank device.
9. A magnetic disk device comprising:
a connector for receiving commands from a higher rank device,
a first driving circuit to drive said spindle motor;
a voice coil motor to drive said magnetic head; and
a second driving circuit to drive said voice coil motor,
wherein said magnetic disk device has a first mode and a second mode, which is selected by a command received from said higher rank device,
wherein a noise level of said first mode is greater than a noise level of said second mode,
wherein when said first mode is selected said second driving circuit supplies a first driving current to said voice coil motor for seek operation,
wherein when said second mode is selected said second driving circuit supplies a second driving current to said voice coil motor for seek operation,
wherein in response to power on of said magnetic disk device, a last seek mode among a plurality of seek modes is activated in said magnetic disk device.
10. The magnetic disk device according to claim 9, wherein said last seek mode is set after a stable state is established.
11. The magnetic disk device according to claim 9, wherein said information on said last seek mode is stored inside said magnetic disk device.
12. The magnetic disk device according to claim 9, wherein said last seek mode is a working mode used in a data transfer to said magnetic disk device from said higher rank device.
13. The magnetic disk device according to claim 12, further comprising:
wherein said information is stored on the surface of said disk-shaped memory medium.
14. A magnetic disk device comprising:
a connector to be coupled to a higher rank device,
wherein said second drive current is smaller than said first drive current,
wherein after said magnetic disk device is powered on, a stable state is established by using a fixed mode and then a seek mode is activated in said magnetic disk device, and
wherein said seek mode is one of said first mode or said second mode, which was used before shutting off said magnetic disk device.
US11050699 1994-06-07 2005-02-07 Information storing device and method for controlling same to record/reproduce information by selecting one of working modes Active 2019-08-13 US7982999B2 (en)
JP06-125375 1994-06-07
JP06-219790 1994-09-14
US20050146806A1 true US20050146806A1 (en) 2005-07-07
US7982999B2 true US7982999B2 (en) 2011-07-19
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