JP2007172833A - Information recording and/or reproducing device, and device for controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and/or reproducing device capable of reducing power consumption during a seeking operation, and its control device, regarding an information recording and/or reproducing device for recording information in a medium and/or reproducing information from the medium, and a device for controlling the same. <P>SOLUTION: The information recording and/or reproducing device for reproducing servo information recorded beforehand in a medium and executing a seeking operation based on the servo information includes a first control unit for instructing the seeking operation based on a command received from a host device, and a second control unit operated independently of the first control unit. The second control unit includes a counting means for starting counting upon detecting the servo information during the seeking operation started based on the command, a predicting means for predicting detection timing of next servo information based on the counting result, and a power saving means for executing power saving processing until the next servo information appears based on the prediction result. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information recording and / or reproducing apparatus and a control apparatus for the information recording and / or reproducing apparatus, and in particular, information recording and / or reproducing for recording information on a medium and / or reproducing information from the medium. The present invention relates to an apparatus and a control apparatus for an information recording and / or reproducing apparatus.

  In recent years, power saving of electronic devices has been demanded, and this is no exception in information recording and / or reproducing devices such as magnetic disk devices. Moreover, in the information recording and / or reproducing apparatus such as a magnetic disk device, the rotational speed of the medium and the operation clock of the mounted LSI increase year by year, but the access time is required to be further shortened. As a result, the power consumption of the magnetic disk device increases, so that conventional power saving measures are not sufficient. In addition, although the number of rotations of the medium has increased, there is a need for shortening the start-up time until steady rotation, but if the reduction is attempted, the amount of current consumed will increase accordingly, and the power consumption will also increase. .

  FIG. 1 is a perspective view of a magnetic disk device, and FIG. 2 is a block diagram of the magnetic disk device.

  The magnetic disk device 1 includes a disk enclosure 11 and a printed circuit board 12. The disk enclosure 11 includes a magnetic disk 21, a spindle motor (SPM) 22, a magnetic head 23, a head arm 24, a voice coil motor (VCM) 25, and a head IC 26 inside a case 27 and a cover 28. It has a built-in configuration.

  The magnetic head 23 is fixed to the tip of the head arm 24 and is disposed to face the magnetic disk 21. A recording current corresponding to the recording information is supplied from the head IC 26 to the magnetic head 23 during information recording. The magnetic head 23 generates a magnetic flux by a recording current. The magnetic flux generated by the magnetic head 23 acts on the magnetic disk 21 to magnetize the magnetic disk 21. As described above, information is magnetically recorded on the magnetic disk 21.

  Further, during reproduction, the magnetization pattern of the magnetic disk 21 acts on the magnetic head 23, and a reproduction current is generated in the magnetic head 23. The reproduction current is supplied to the head IC 26. The head IC 26 amplifies the reproduction current from the magnetic head 23 and supplies it to the printed circuit board 12.

  The printed circuit board 12 includes an HDC (hard disk drive controller) 31, a buffer memory 32, an RDC (read channel) 33, an SVD (servo demodulator) 34, a DSP (digital signal processor) 35, an SVC (servo combo) 36, an MCU. A (micro-control unit) 37, a memory 38, and an oscillator 39 are mounted.

  The RDC 33 modulates the recording information to generate a recording signal, supplies the recording signal to the head IC 26, demodulates the information from the reproduction signal from the head IC 26, and supplies the information to the HDC 31. The HDC 31 performs control of the buffer memory 32 / SCSI protocol control / ECC (Error Correction Code) control, and also controls reproduction and recording operations by a formatter function.

  A playback signal is supplied to the SVD 34 from the RDC 33. The SVD 34 demodulates servo information from the reproduction signal from the RDC 33. The servo information demodulated by the SVD 34 is supplied to the MCU 37 and the DSP 35.

  The MCU 37 and the DSP 35 operate independently with the firmware stored in the memory 38, and control the RDC 33, SVD 35, SVC 36, and HDC 31. Here, the supply of the internal clock of the hard disk device 1 will be described.

  FIG. 3 is a diagram showing an internal clock supply path of the hard disk device 1. In the figure, the same components as in FIG.

  The oscillator 39 oscillates at an oscillation frequency of 20 MHz. The output oscillation signal of the oscillator 39 is supplied to the SVD 34, DSP 35, and MCU 37. The SVD 34 and the DSP 35 divide the oscillation signal having a frequency of 20 MHz from the oscillator 39 using a PLL circuit or the like to generate an operation clock, and execute processing based on the generated operation clock.

  Further, the MCU 31 divides the oscillation signal having a frequency of 20 MHz from the oscillator 39 using a PLL circuit or the like, generates an operation clock, and executes processing based on the generated operation clock. Further, the MCU 31 multiplies the oscillation signal with a frequency of 20 MHz from the oscillator 39 by using a PLL circuit or the like, divides it, generates a clock with a frequency of 40 MHz, and supplies it to the HDC 31 and the RDC 33. The HDC 31 and the RDC 33 generate an operation clock from a clock with a frequency of 40 MHz, and execute processing based on the generated operation clock.

  At this time, the MCU 37 performs power saving based on firmware, for example. Conventionally, as the power save of the magnetic disk device, there are mainly the following first to third power saves.

  In the first power save, when a command is not issued from the host device within a certain time, the MCU 37 operates the HDC 31, SVD 34, and DSP 35 normally only when reading the servo information of the magnetic disk 21, and otherwise, the HDC 31, A part of the functions of the SVD 34 and the DSP 35 is put into a power saving state. In the first power save, the power consumption of the magnetic disk device 1 during the track following operation in which the recording / reproducing operation is not performed on the magnetic disk 21 can be suppressed. However, the power saving of the head IC 26 was not performed.

  The second power save is to uniformly slow down the operation clocks of the HDC 31, RDC 33, SVD 34, DSP 35, and MCU 37.

  In the second power save, the power consumed by the HDC 31, RDC 33, SVD 34, DSP 35, and MCU 37 operating at high speed can be suppressed.

  In addition, the third power save is to prevent various LSIs from operating by switching between various power supplies such as HDC31, RDC33, SVD34, DSP35, MCU37, etc., which are not required for start-up, and their power sources. It is. In the third power save, the power consumption can be reduced by stopping the operation of the LSI that is unnecessary for activation.

  However, in recent magnetic disk devices, the power consumption increases with an increase in the number of rotations and an increase in the operation clock, which exceeds the power consumption reduced by the first to third power saves as described above. Has occurred. Therefore, further power saving is desired.

  The present invention has been made in view of the above points, and an object thereof is to provide an information recording and / or reproducing apparatus that can reduce power consumption during a seek operation, and a control apparatus thereof.

  The present invention is an information recording and / or reproducing apparatus that reproduces servo information recorded in advance on a medium and performs a seek operation based on the servo information, and instructs the seek operation based on reception of a command from a host device. A first control unit, and a second control unit that operates independently of the first control unit. The second control unit counts when servo information is detected during a seek operation that is started based on an instruction. Counting means for starting the operation, prediction means for predicting the detection timing of the next servo information based on the count result, power saving means for performing power saving processing until the next servo information appears based on the prediction result, It is characterized by having.

  When the seek operation is completed, the second control unit returns a response to the first control unit.

  The present invention is also a control device for an information recording and / or reproducing device that reproduces servo information recorded in advance on a medium and performs a seek operation based on the servo information, and counts when servo information is detected during the seek operation. Counting means for starting the operation, prediction means for predicting the detection timing of the next servo information based on the count result, power saving means for performing power saving processing until the next servo information appears based on the prediction result, It is characterized by having.

  As described above, according to the present invention, it is possible to reduce power consumption during a track following operation, for example, while waiting for a command from a host device. It has features such as being able to greatly reduce power. In addition, according to the present invention, it is possible to reduce the power consumption during the seek operation, so that the power consumption other than during recording and / or reproduction can be greatly reduced.

  Furthermore, according to the present invention, it is possible to reduce the power consumption at the time of startup, so that the power consumption other than during recording and / or reproduction can be greatly reduced.

  FIG. 4 is a block diagram showing an embodiment of the present invention. In the figure, the same components as in FIG.

  The magnetic disk device 100 of this embodiment is different from the magnetic disk device 1 shown in FIGS. 1 and 2 in the firmware for power saving of the MCU 37 and the DSP 35. The magnetic disk device 100 is different from the magnetic disk device 1 shown in FIGS. 1 and 2 in that it has a −5V power supply control circuit 40.

  FIG. 5 is a flowchart of the process of the MCU 37 during power save, FIG. 6 is a flowchart of the process of the HDC 31 during power save, and FIG. 7 is a flowchart of the process of the DSP 35 during power save.

  As shown in FIG. 5, when the MCU 37 does not receive a command from the host device for a certain period of time in step S1-11, the MCU 37 instructs the HDC 31 to save power in step S1-12. As shown in FIG. 6, when the HDC 31 receives a power save instruction from the MCU 37 in step S1-21, the HDC 31 sets the disk formatter / ECC engine to the sleep mode in step S1-22. In step S1-23, the memory 38 is set to the self-refresh mode. In step S1-24, the buffer controller is set to the sleep mode.

  Further, the MCU 37 issues a power save command to the DSP 35 in step S1-13 as shown in FIG.

  As shown in FIG. 7, when the DSP 35 receives a power save mode command from the MCU 37 in step S1-31, the DSP 35 executes power save for the RDC 33, SVC 36, and head IC 26 in step S1-32.

  Here, the power saving operation of the RDC 33 will be described. The RDC 33 includes VGA (Variable Gain Amplifier) and ASC (amplitude Asymmetry Correction). VGA and ASC are circuits for shaping the waveform of the reproduction signal reproduced by the magnetic head 23.

  The RDC 33 stops the operation of the built-in VGA and ASC according to the power save instruction from the MCU 37. The operation control of the VGA and ASC is performed, for example, by giving a constant input signal from the MCU 37 to the RDC 33 or stopping the operation clock supplied to the VGA or ASC. As described above, the power consumption of the RDC 33 can be reduced. Note that the power saving of the RDC 33 is executed when the MCU 37 stores data in a specific register provided in the RDC 33.

  Next, power saving in the SVD 34 will be described.

  The SVD 34 includes an ADC (analog digital converter), a PLL (phase locked loop) circuit, an AGC (automatic gain control) circuit, and the like. The ADC is a circuit that converts servo information from an analog signal to digital data. The PLL circuit is a circuit that generates an internal clock. The AGC circuit is a circuit that makes the amplitude of an input signal constant. The SVD 34 performs power saving by controlling the operation of these built-in circuits in accordance with a power saving instruction from the DSP 35. For example, ADC conversion is stopped. Further, the PLL circuit and the AGC circuit stop the operation by keeping the control signal supplied to the circuit constant. Thus, power consumption can be reduced.

  The power saving of the SVD 34 is executed when the DSP 35 stores data in a specific register built in the SVD 34.

  Next, power saving of the head IC 26 which is a circuit for recording information on the medium and / or exchanging information with the medium will be described in detail.

  First, the head IC power supply circuit 40 will be described in order to explain the power saving operation when the spindle motor 22 is started.

  FIG. 8 is a block diagram of the head IC power supply circuit 40.

  The -5V power supply control circuit 40 includes a -5V power supply generation circuit 41 and a switch 42.

  The −5 V power supply generation circuit 41 generates a power supply voltage of −5 [V] from the power supply voltage of 5 [V]. The power supply voltage of −5 [V] generated by the −5 V power supply generation circuit 41 is supplied to the switch 42. The switch 42 is provided between the -5V power supply generation circuit 41 and the head IC 26. When the switch 42 is on, the switch 42 supplies the -5 [V] power supply voltage generated by the -5V power supply generation circuit 41 to the head IC 26. When it is off, the -5V power supply voltage is not supplied to the head IC 26. The switch 42 is switched by a switching control signal from the power supply controller 43 when the spindle motor 22 is started. As described above, power saving is performed when the spindle motor 22 is started.

  The power supply controller 43 is provided in the SVC 36 and is turned on in response to a power save instruction from the DSP 35 and turned off in response to a power save cancel instruction.

  Further, the DSP 35 thins out interrupts to the MCU 37 for servo control in step S2-3. The thinning out of the interrupt to the MCU 37 is performed, for example, by dividing the operation clock. For this reason, the processing time of the interrupt processing becomes longer.

  Next, the power saving operation after starting the spindle motor 22 will be described.

  The head IC 26 does not supply a sense current to the magnetic head 23 during normal power saving after the spindle motor 22 is started. Furthermore, the head IC 26 cuts off the supply of power to the amplifier for amplifying the signal recorded on the magnetic disk 21 during normal power saving after the spindle motor 22 is started. These operations are executed by writing values to specific registers provided in the head IC 26 by the MCU 37 or the DSP 35.

  FIG. 9 is a diagram for explaining a process for thinning out the interrupt process. 9A shows the servo gate signal, FIG. 9B shows the interrupt processing timing of the DSP 35, and FIG. 9C shows the interrupt processing timing of the MCU 37.

  The DSP 35 rises at the same time as the servo gate signal rises as shown in FIG. 9B, and starts interrupt processing for servo control. As shown in FIG. 9C, the MCU 37 starts an interrupt process for servo control after a lapse of a predetermined time t0 from the rise of the servo gate signal.

  For example, as shown in FIG. 9, the DSP 35 and the MCU 37 perform an interrupt process at a rate of once every two servo gate signals. That is, the processing for acquiring servo information is not performed for each servo information, but once every two servo information. Since the interrupt processing for servo control of the DSP 35 and MCU 37 is thinned out, the number of interrupt processing for servo control of the DSP 35 and MCU 37 is halved as compared with the normal case, so that power consumption can be reduced. At this time, by dividing the operation clock of the DSP 35 and MCU 37, the interval of the interrupt processing becomes as long as T10 as shown in FIG. As a result, the number of interrupt processing is reduced. Also, the interrupt processing time becomes longer as shown at T11 and T12. Therefore, power consumption can be reduced.

  Note that the number of interrupts to be thinned out is not limited to once every two times, and if it is thinned out at a rate of two times or more and once every plural times, there is an effect of reducing power consumption. .

  Returning to FIG. 7, the description will be continued. Next, the DSP 35 sets the internal operation clock to 1/8 of the normal operation clock in step S1-34. The DSP 35 reduces the number of interrupts to the MCU 37 and reduces power consumption by reducing the internal operation clock to 1/8 of the normal operation clock. When the DSP 35 enters the power saving state, the DSP 35 issues a power saving notification to the MCU 37 in step S1-35 informing that the power saving state has been entered.

  As shown in FIG. 6, when the MCU 37 receives the power save notification from the DSP 35 in step S1-14, the MCU 37 sets the frequency of the internal operation clock to 1/32 of the frequency of the normal operation clock in step S1-15. In the MCU 37, the frequency of the internal operation clock is 1/32 of the frequency of the normal operation clock, so that the processing speed of the interrupt processing from the DSP 35 is reduced and the power consumption is reduced.

  Next, the operation when canceling the power save will be described.

  FIG. 10 is a process flowchart when the HDC 31 cancels the power save, FIG. 11 is a process flowchart of the MCU 37, and FIG. 12 is a process flowchart of the DSP 35.

  As shown in FIG. 10, when the HDC 31 receives a command from the upper apparatus in step S2-11, the HDC 31 notifies the MCU 37 in step S2-12.

  As shown in FIG. 11, when a command is input from the host device in step S2-21, the MCU 37 restores the operation clock in step S2-22. Next, the MCU 37 issues a command for canceling the power save to the DSP 35 in step S2-23.

  As shown in FIG. 12, when the DSP 35 receives a command for canceling the power save command from the MCU 37 in step S2-31, the DSP 35 restores the operation clock in step S2-32, and in step S2-33, the RDC / SVD / head. The power saving of the IC is canceled, and the thinning out of the interrupt to the MCU 37 is stopped in step S2-34.

  Further, as shown in FIG. 11, the MCU 37 instructs the HDC 31 to return the function in step S2-24.

  As shown in FIG. 10, when the HDC 31 receives a function return instruction from the MCU 37 in step S2-13, the HDC 31 restores the internal operation clock in step S2-14. In step S2-15, the built-in buffer controller is restored, and in step S2-16, the memory 38 is restored from the self-refresh mode. In step S2-17, the disk formatter / ECC engine is returned from the sleep mode.

  With the above processing, the magnetic disk device 1 is released from the power saving state.

  If the above procedure is ignored, the timing of the operation in the MCU 37 and the DSP 35 cannot be taken, and the return from the power saving state cannot be performed.

  Next, the power saving process at the start of the seek operation will be described in detail.

  FIG. 13 is a flowchart of the power save process of the HDC 31 during the seek operation, FIG. 14 is a flowchart of the power save process of the MCU 37 during the seek operation, and FIG. 15 is a flowchart of the power save process of the DSP 35 during the seek operation.

  When the HDC 31 receives a command from the host apparatus in step S3-11 shown in FIG. 13, the HDC 31 notifies the MCU 33 in step S3-12. As shown in FIG. 14, when the MCU 33 receives a seek command notification from the HDC 31 in step S3-21, the MCU 33 issues a seek command to the DSP 35 in step S3-22. In addition, the MCU 33 transfers parameters for performing power saving to the RDC 33 in step S3-23.

  The parameters from the MCU 33 are stored in a specific register of the RDC 33. The RDC 33 executes the power saving of the RDC 33 by storing the parameter for performing the power saving in the specific register.

  When the parameter transfer to the RDC 33 is completed in step S3-24, the DSP 35 is notified that the parameter transfer to the RDC 33 is completed in step S3-25.

  As shown in FIG. 15, when the DSP 35 receives a seek command from the MCU 37 in step S3-31, and receives a parameter transfer completion notification from the MCU 37 in step S3-32, the DSP 35 supplies power to the RDC 33, SVD 34, and head IC 26 in step S3-33. Instruct to save. The power saving instruction to the RDC 33, SVD 34, and head IC 26 is based on the storage of data in the specific register.

  Next, the DSP 35 expands the servo gate prediction detection window width in step S3-34 so that the servo information can be reliably read.

  FIG. 16 is a diagram for explaining the servo gate prediction detection window generation operation. 16A shows the servo gate signal, FIG. 16B shows the servo gate prediction detection window, and FIG. 16C shows the internal count value of the DSP 35.

  Tracks are formed concentrically on the magnetic disk 21, and servo information is written in the tracks at regular intervals. A servo mark is written at the head of each servo information. The DSP 35 performs interrupt processing to the MCU 37 in synchronization with the servo mark. In the interrupt process, necessary information is exchanged between the DSP 35 and the MCU 37. The exchanged information is, for example, an error notification of an error that has occurred in the data write or a notification indicating that the track following operation has failed.

  The rotation of the magnetic disk 21 is kept constant. For this reason, the period of the servo mark appearing on one track is constant. The DSP 35 predicts the timing at which the next servo mark appears by a built-in counter.

  For example, as shown in FIG. 16C, counting is performed after a servo mark appears at time t1, and when a predetermined count value C0 is reached, it can be predicted that the next servo mark will appear. Therefore, a prediction detection window including the servo gate signal shown in FIG. 16A can be created based on the count value shown in FIG. 16C, as shown in FIG. Servo information is detected based on the prediction detection window created as described above.

  At this time, the detection timing can be freely changed by changing the count value of the counter or the frequency of the clock to be counted.

  As shown in FIG. 15, when the DSP 35 reaches the head / cylinder position of the target in step S3-35, the DSP 35 ends the power saving and seeking operation in step S3-36, notifies the MCU 37 of that, and ends the processing.

  As shown in FIG. 14, when the MCU 37 receives a seek end notification from the DSP 35 in step S3-26, the MCU 37 ends the process for power saving during the seek operation.

  17 and 18 are diagrams for explaining the power saving operation during the seek operation. 17A and 18A are servo gate signals, FIGS. 17B and 18B are power saving states of the head IC 26, and FIGS. 17C and 18C are powers of the SVD 34. 17D and 18D show the power saving state of the RDC 33, and FIGS. 17E and 18E show the seek control operation state of the DSP 35. FIG. In FIG. 17A, a high level indicates a timing at which servo information is reproduced, and in FIGS. 17B to 17D, a high level indicates a power save state.

  At time t1, the MCU 37 starts transferring parameters for power saving to the specific registers of the RDC 33, SVD 34, and SVC 36, and when a seek command is issued to the DSP 35, as shown in FIG. 17E, at time t2. The DSP 35 starts a seek operation.

  When the transfer of parameters for power saving from the MCU 37 to the RDC 33 and the specific registers of the SVD 34 and SVC 36 is completed at time t3, the RDC 33, SVD 34, and SVC 36 have the same functions as those shown in FIGS. D), as shown in FIGS. 18B, 18C, and 18D, the power save is canceled at the timing T1 when the servo information is reproduced, the servo information can be reproduced, and the data is reproduced. Power save is performed at the timing T2.

  At this time, the DSP 35 writes data to a specific register provided in the head IC 26, whereby power saving of the head IC 26 is performed. When the seek operation is completed at time t4 shown in FIG. 18, the power saving of the RDC 33, SVD 34, and SVC 36 is canceled as shown in FIGS. 18B, 18C, and 18D.

  As described above, power consumption can be reduced by stopping or thinning out functions unnecessary for the seek operation even during the seek operation.

  Next, the power saving operation when starting up the magnetic disk device 100 will be described.

  FIG. 19 is a flowchart of the power saving process of the MCU 37 when the spindle motor is activated, and FIG. 20 is a flowchart of the power saving process of the DSP 35 when the spindle motor is activated.

  As shown in FIG. 19, when there is an operation instruction from the host device in step S5-1, the MCU 37 instructs the DSP 35 to start the spindle motor 22 in step S5-2.

  As shown in FIG. 20, the DSP 35 does not reproduce information from the magnetic disk 21 or record information on the magnetic disk 21 when there is no activation instruction in step S6-1. In step S6-2, the SVC 36 is instructed to stop supplying the -5V power supply voltage to the head IC 26, that is, a power save instruction. The SVC 36 turns off the switch 42 of the -5V power supply control circuit 40 when instructed by the DSP 35 to stop supplying the -5V power supply voltage to the head IC 26. When the switch 42 of the −5V power supply control circuit 40 is turned off, the −5V power supply voltage is not applied to the head IC 26. The head IC 26 stops operating when the -5V power supply voltage is not applied. As a result, wasteful power consumption due to switching loss in the head IC 26 and the −5V power supply generation circuit 41 is reduced.

  In addition, when there is an instruction to start the spindle motor 22 from the MCU 37 in step S6-1, an instruction to start the spindle motor 22 is issued to the SVC 36 in step S6-3. The SVC 36 checks the rotation of the spindle motor 22 in step S6-4 when the startup power from the DSP 35 is turned on and there is an instruction to start the spindle motor 22.

  When the rotation of the spindle motor 22 does not reach the steady rotation in step S6-5, the information recorded on the magnetic disk 21 cannot be correctly reproduced. Therefore, the SVC 36 is maintained in the power saving state in order to reduce the power consumption of the head IC 26. To do.

  When the rotation of the spindle motor 22 reaches a steady rotation in step S6-5, the power save instruction to the SVC 36 is canceled in step S6-6. The SVC 36 turns on the switch 42 of the −5V power supply control circuit 40 when the DSP 35 cancels the power saving instruction. When the switch 42 of the −5V power supply control circuit 40 is turned on, a −5V power supply voltage is applied to the head IC 26. The head IC 26 starts to operate when a -5V power supply voltage is applied. When the head IC 26 operates, information can be recorded on the magnetic disk 21 and information recorded on the magnetic disk 21 can be reproduced.

As described above, useless power consumption can be reduced by stopping the operation of the head IC 26 until the spindle motor 22 rotates at the time of startup or the like. In this embodiment, the magnetic disk device is described as an example of the information storage and / or reproduction device. However, the present invention is not limited to the magnetic disk device, and can be applied to an optical disk device, a magneto-optical disk device, and the like. It is.
(Appendix 1)
An information recording and / or reproducing apparatus for reproducing servo information recorded in advance on a medium and performing a track following operation based on the servo information, wherein the operation clock frequency is reduced by a predetermined procedure during the track following operation. An information recording and / or reproducing apparatus comprising power saving means for performing power saving.
(Appendix 2)
The information recording and / or reproducing apparatus according to claim 1, wherein the power saving means performs power saving by reducing the number of times of track tracking control.
(Appendix 3)
The information recording and / or reproducing apparatus according to appendix 1 or 2, wherein the power saving means performs power saving by reducing an operation clock during the track following operation.
(Appendix 4)
4. The information recording and / or reproduction according to any one of appendices 1 to 3, wherein the power saving means performs power saving when a command is not supplied from the host device for a certain time during the track following operation. apparatus.
(Appendix 5)
An information recording and / or reproducing apparatus for reproducing servo information recorded in advance on a medium and performing a seek operation based on the servo information, comprising power saving means for performing power save during the seek operation Information recording and / or reproducing apparatus.
(Appendix 6)
The information recording and / or reproducing apparatus according to appendix 5, wherein the power saving unit stops power supply to a circuit for recording information on the medium and / or exchanging information with the medium.
(Appendix 7)
An information recording and / or reproducing apparatus for recording and / or reproducing information from or on a medium by rotating the medium by a spindle motor, wherein the power until the spindle motor reaches a steady rotational speed. An information recording and / or reproducing apparatus comprising power saving means for performing saving.
(Appendix 8)
The information recording and / or reproducing apparatus according to appendix 7, wherein the power saving unit stops power supply to a circuit for recording information on the medium and / or exchanging information with the medium.
(Appendix 9)
A power saving method for an information recording and / or reproducing apparatus that reproduces servo information recorded in advance on a medium and performs a track following operation based on the servo information, and lowers the operating clock frequency during the track following operation. Power saving method for information recording and / or reproducing apparatus, characterized in that power saving is performed by
(Appendix 10)
The information recording and / or reproducing apparatus power saving method according to appendix 9, wherein power saving is performed by reducing the number of times of track following control during the track following operation.
(Appendix 11)
11. The information recording and / or reproducing apparatus power saving method according to appendix 9 or 10, wherein power saving is performed by reducing an operation clock during the track following operation.
(Appendix 12)
12. The information recording and / or reproducing device power saving method according to any one of appendices 9 to 11, wherein power saving is performed when a command is not supplied from the host device for a certain time during the track following operation.
(Appendix 13)
An information recording and / or reproducing apparatus power saving method for reproducing servo information recorded in advance on a medium and performing a seek operation based on the servo information, wherein the power saving is performed during the seek operation. Information recording and / or reproducing apparatus power saving method.
(Appendix 14)
14. The information recording and / or reproducing apparatus according to appendix 13, wherein the power saving unit stops power supply to a circuit for recording information on the medium and / or exchanging information with the medium.
(Appendix 15)
A power saving method of an information recording and / or reproducing apparatus for recording information on and / or reproducing information from the medium by rotating the medium by a spindle motor, until the spindle motor reaches a steady rotational speed A power saving method for an information recording and / or reproducing apparatus, wherein power saving is performed during
(Appendix 16)
16. The information recording and / or reproducing apparatus power saving method according to appendix 15, wherein power supply to a circuit for recording information on the medium and / or exchanging information with the medium is stopped.

1 is a perspective view of a magnetic disk device. 1 is a block configuration diagram of a magnetic disk device. 3 is a diagram illustrating a supply path of an internal clock of the hard disk device 1. FIG. It is a block block diagram of one Example of this invention. It is a process flowchart at the time of the power saving of MCU37. 4 is a process flowchart when the HDC 31 saves power. It is a process flowchart at the time of the power saving of DSP35. 3 is a block configuration diagram of a −5V power supply control circuit 40. FIG. It is a figure for demonstrating the process for thinning out an interruption process. 6 is a process flowchart when canceling power save of the HDC 31; It is a process flowchart of MCU37. It is a processing flowchart of DSP35. It is a flowchart of the power saving process of HDC31 at the time of a seek operation. It is a flowchart of the power saving process of MCU37 at the time of a seek operation. It is a flowchart of the power saving process of DSP35 at the time of a seek operation. It is a figure for demonstrating a servo gate prediction detection window production | generation operation | movement. It is a figure for demonstrating the power saving operation | movement at the time of a seek operation | movement. It is a figure for demonstrating the power saving operation | movement at the time of a seek operation | movement. It is a flowchart of the power saving process of MCU37 at the time of spindle motor starting. It is a flowchart of the power saving process of DSP35 at the time of spindle motor starting.

Explanation of symbols

11 Disk Enclosure 12 Printed Circuit Board 21 Magnetic Disk 22 Spindle Motor 23 Magnetic Head 24 Head Arm 25 Voice Coil Motor 26 Head IC
31 HDC
32 Buffer memory 33 RDC
34 SVD
35 DSP
36 SVC
37 MCU
38 Memory 39 Oscillator 40 -5V Power Supply Control Circuit 100 Magnetic Disk Device

Claims (3)

An information recording and / or reproducing apparatus that reproduces servo information recorded in advance on a medium and performs a seek operation based on the servo information,
A first control unit that instructs a seek operation based on reception of a command from a higher-level device;
A second control unit that operates independently of the first control unit;
The second control unit is configured to start counting when servo information is detected during a seek operation started based on the instruction;
Predicting means for predicting the detection timing of the next servo information based on the count result;
An information recording and / or reproducing apparatus comprising power saving means for performing power saving processing until the next servo information appears based on the prediction result. The information recording and / or reproducing apparatus according to claim 1, wherein the second control unit returns a response to the first control unit when the seek operation is completed. A control device for an information recording and / or reproducing device that reproduces servo information recorded in advance on a medium and performs a seek operation based on the servo information,
Count means for starting counting when servo information is detected during seek operation;
Predicting means for predicting the detection timing of the next servo information based on the count result;
A control apparatus for an information recording and / or reproducing apparatus, comprising: power saving means for performing a power saving process until the next servo information appears based on the prediction result.

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