JP4288594B2 - Disk drive device and disk access method - Google Patents

Description

The present invention relates to a disk drive device and a disk access method , and is suitable for application to, for example, a magneto-optical disk drive.

  Conventionally, a CAV (Constant Angular Velocity) method or a CLV (Constant Linear Velocity) method is used as a data access method for an optical disc.

  In the CAV method, as shown in FIG. 7B, the rotational speed of the optical disk is always controlled to be constant. In this case, although the rotation control of the spindle motor that drives the optical disk is simplified, the linear velocity at the outer periphery of the disk becomes high as shown in FIG. 7A, and an error is likely to occur at the outer periphery of the disk. There's a problem.

  On the other hand, in the CLV method, the rotational speed of the spindle motor is constantly changed according to the position of the optical pickup so that the linear velocity of the optical disk passing through the optical pickup 5 is always constant (FIG. 8A) ( FIG. 8 (B)). For this reason, the CLV method has a problem that the rotational speed control of the spindle motor becomes more complicated than the CAV method.

  In the CLV system, as shown in FIG. 8B, when the optical pickup is located at the innermost periphery of the disk, the rotation speed of the spindle motor becomes maximum, and the rotation due to mechanical and electrical restrictions at this time. There is a problem that the upper limit of the number determines the linear velocity of the entire optical disc.

  In order to solve such problems of the CAV method and the CLV method, an access method called a ZCLV (Zone CLV: constant zone linear velocity) method has been proposed (for example, see Patent Document 1).

  In the ZCLV method, the optical disk is divided into a plurality of concentric zones, and the linear velocity is constant in each zone, or the rotation speed is constant in each zone as shown in FIG. Thus, the number of rotations of the spindle motor is controlled. At this time, the linear velocity is low in the inner zone, and the zone linear velocity is increased as it moves to the outer zone. For this reason, in the ZCLV system, as shown in FIG. 9B, when the optical pickup moves to another zone, the rotation speed changes abruptly. In the ZCLV method, high speed access can be performed by improving the linear velocity on the outer periphery of the disk while keeping the upper limit of the rotation speed of the spindle motor to a certain extent.

  As described above, in the ZCLV system, it is necessary to rapidly change the rotation speed of the spindle motor when the optical pickup moves to another zone. At this time, the power consumption of the spindle motor increases or access to the optical disk is interrupted. There has been a problem that the access speed is reduced.

The present invention has been made in consideration of the above points, and an object of the present invention is to propose a disk drive device and a disk access method in which the access speed for a disk-shaped recording medium is improved.

In the present invention for solving the above problems, setting the zone data size is fixed with respect to the disc-shaped recording medium, the disk drive for accessing one constant speed of within the zone, the disk-shaped recording medium Based on the head position of the access data, the zone position setting means for setting the position of the zone, and the linear speed for setting the linear speed for accessing the zone according to the position of the zone set by the zone position setting means Setting means, drive means for rotationally driving the disk-shaped recording medium at a set linear velocity, and access means for accessing the disk-shaped recording medium rotated by the drive means are provided.

  By adaptively setting the zone position based on the head position of the access data, the access speed for the disk-shaped recording medium can be improved by reducing the frequency of movement of the access means between the zones during access.

  In the present invention, when the data amount of the access data is more than half of the zone data amount, the head position of the zone is set to the head position of the access data. This minimizes the possibility of movement of the access means between zones, and improves the access speed for the disk-shaped recording medium.

  Further, in the present invention, when the data amount of the access data is less than half the data amount of the zone, the center position of the zone is set to the head position of the access data. As a result, the access means can be prevented from moving between zones, the access speed to the disk-shaped recording medium can be improved, and the access data can be accessed under optimum conditions.

  Further, in the present invention, when the current position of the access means for accessing the disk-shaped recording medium and the head position of the access data are in the same zone, the zone position is not reset. Thereby, unnecessary zone movement can be prevented.

  According to the present invention, the zone position is adaptively changed based on the start position of the access data, thereby reducing the frequency of movement of the access means between zones during access and improving the access speed to the disk-shaped recording medium. The disc drive device can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration of Disk Drive Device In FIG. 1, reference numeral 1 denotes a disk drive device according to the present invention as a whole, and the CPU 2 controls the entire disk drive device 1 through a disk controller 3.

  The optical disk 100 is placed on a turntable (not shown), and is rotationally driven by the ZCLV method by a spindle motor 4 as a driving means when accessing (recording and reproducing) data. Then, data recorded on the optical disc 100 and ADIP (Address In Pre Groove) information are read by the wobbling groove by the optical pickup 5 as an access means.

  The optical pickup 5 includes a laser diode 10 serving as a laser light source, a photodetector 11 for detecting reflected light, a biaxial actuator 12 that holds an objective lens serving as an output end of the laser light, and an APC that performs output control of the laser diode 10. (Auto Power Control) circuit 13 and an optical system that irradiates the disk recording surface with laser light through the objective lens and guides the reflected light to the photodetector 11 are mounted.

  The biaxial actuator 12 holds the objective lens movably in the tracking direction and the focus direction. Further, the slide drive unit 14 reciprocally drives the entire optical pickup 5 in the disk radial direction under the control of the servo drive circuit 15.

  The photodetector 11 has a plurality of photodiodes. Each photodiode receives the reflected light from the optical disc 100 and photoelectrically converts it, generates a received light signal corresponding to the received light quantity, and supplies it to the analog signal processor 16.

  The read channel front end 17 of the analog signal processor 16 generates a reproduction signal RF from the received light signal and inputs it to the analog-digital converter 19. On the other hand, the matrix amplifier 18 of the analog signal processor 16 performs matrix calculation on the light reception signals from the respective photodiodes, and provides focus error signal FE and tracking error signal TE for servo control, and wobbling groove information. Push-pull signals PP are generated and input to the analog-digital converter 19.

  The analog-digital converter 19 digitally converts the reproduction RF signal, the focus error signal FE, the tracking error signal TE, and the push-pull signal PP, and inputs them to the digital signal processor 20.

  The digital signal processor 20 includes a write pulse generator 21, a servo signal processor 22, a wobble signal processor 23, and an RF signal processor 24.

  The wobble signal processor 23 decodes the push-pull signal PP, extracts ADIP information composed of addresses, physical format information, and the like, and supplies them to the CPU 2.

  The servo signal processor 22 generates various servo drive signals for focus, tracking, slide, and spindle based on the focus error signal FE and the tracking error signal TE, and supplies the servo drive circuit 15 via the digital / analog converter 27. The servo signal processor 22 supplies a servo drive signal for instructing operations such as focus search, track jump, and seek to the servo drive circuit 15 in accordance with a command from the CPU 2. The servo drive circuit 15 drives the biaxial actuator 12, the slide drive unit 14, and the spindle motor 4 based on the servo drive signal.

  On the other hand, the RF signal processor 26 performs demodulation processing on the reproduction RF signal to generate reproduction data, and supplies this to the disk controller 3.

  The disk controller 3 includes an encoding / decoding unit 31, an ECC (Error Correcting Code) processing unit 32, and a host interface 33.

  During reproduction, the disk controller 3 performs decoding processing on the reproduction data supplied from the RF signal processor 26 by the encoding / decoding unit 31, further performs error correction processing by the ECC processing unit 32, and externally passes through the host interface 33. To the host device 200 (for example, a personal computer).

  The encoding / decoding unit 31 of the disk controller 3 extracts subcode information, address information, management information, and additional information from information obtained by the decoding process, and supplies these information to the CPU 2.

  Further, the CPU 2 executes a recording operation on the optical disc 100 in response to a write command from the host device 200.

  That is, at the time of recording, the disk controller 3 adds an error correction code to the recording data supplied from the host device 200 by the ECC processing unit 32 and further performs the encoding process by the encoding / decoding unit 31, and then the digital signal processor. 20 write pulse generators 21 are supplied.

  The write pulse generator 21 performs processing such as waveform shaping on the recording data to generate laser modulation data, and supplies this to the APC circuit 13.

  The APC circuit 13 drives the laser diode 10 in accordance with the laser modulation data, and writes data on the optical disc 100 with a laser output in accordance with the recording data.

(2) Access Using Adaptive ZCLV Method According to the Present Invention As described above, the disk drive device 1 accesses the optical disc 100 using the ZCLV method. At this time, the disk drive device 1 adaptively changes the position of the zone based on the start position (that is, the recording start position or the reproduction start position) of the access data on the optical disk 100 and the data amount of the access data. The frequency of movement of the optical pickup 5 between zones during access is reduced. This access method is called an adaptive ZCLV method.

  In the adaptive ZCLV method, the data size of the zone is always constant. One zone is 800 RUB (Recording Unit Block), and one RUB includes three addresses.

  When the CPU 2 of the disk drive device 1 receives a read / write command from the host device 200, the CPU 2 recognizes the data amount and the data head position (that is, the address) of the access data specified by the read / write command.

  When the data amount of the access data is more than half of the zone data amount (that is, 400 RBU or more), the CPU 2 as the zone position setting means sets the head of the zone to the head position of the access data as shown in FIG. Set. Accordingly, the disk drive device 1 can minimize the possibility that the optical pickup 5 moves across other zones during access to the access data. In this case, the CPU 2 as the linear velocity setting means sets the zone linear velocity to a value corresponding to the center position of the zone based on the linear velocity setting pattern shown in FIG.

  On the other hand, when the data amount of the access data is less than half the zone data size (less than 400 RBU) and the access data head position is outside the zone where the optical pickup 5 is currently located, the zone position setting means As shown in FIG. 4, the CPU 2 sets the center of the zone as the head position of the access data. Accordingly, the disk drive device 1 can prevent the optical pickup 5 from moving across other zones during access to the access data.

  Also in this case, the CPU 2 as the linear velocity setting means sets the linear velocity of the zone to a value corresponding to the center position of the zone based on the linear velocity setting pattern (FIG. 3). For this reason, in the zone, the vicinity of the center position has the linear velocity most suitable for access. In this case, since the head of the access data is located at the center of the zone, the access data can be accessed under the optimum conditions.

  On the other hand, if the data amount of the access data is less than half of the data size of the zone and the head position of the access data is in the zone where the optical pickup 5 is currently located, the zone position setting means and the line As shown in FIG. 5, the CPU 2 as the speed setting means accesses the access data without changing the zone again, while keeping the currently set linear speed. As a result, the disk drive device 1 can prevent a change in the rotational speed associated with unnecessary zone resetting.

  Next, a zone position setting process procedure for performing access by the above-described adaptive ZCLV method will be described in detail with reference to the flowchart shown in FIG.

  The CPU 2 of the disk drive apparatus 1 enters from the start step of the routine RT1, moves to step SP1, waits for a read / write command from the host device 200, and moves to the next step SP2 when receiving the read / write command.

  In step SP2, the CPU 2 determines whether or not the amount of access data specified by the read / write command is more than half of the zone data amount. If it is determined in step SP2 that the amount of access data is more than half of the zone data amount, the CPU 2 moves to step SP3.

  In step SP3, the CPU 2 sets the head of the zone as the head of the access data as shown in FIG. 2, and then moves to step SP4 to change the linear velocity of the zone to a value corresponding to the center position of the zone. Next step SP5 follows.

  In step SP5, the CPU 2 moves (seeks) the optical pickup 5 to the head position of the access data, and then moves to step SP6 to execute access (read or write) to the access data. When the access to the access data is completed, the process returns to step SP1 to wait for a new read / write command.

  On the other hand, if it is determined in step SP2 that the data amount of the access data is less than half of the zone data amount, the CPU 2 proceeds to step SP7.

  In step SP7, the CPU 2 determines whether or not the head position of the access data is outside the zone where the optical pickup 5 is currently located. If it is determined in step SP7 that the head position of the access data is outside the zone where the optical pickup 5 is currently located, the CPU 2 moves to step SP8.

  In step SP8, the CPU 2 sets the center of the zone to the beginning of the access data as shown in FIG. 4, and then moves to step SP4 to change the linear velocity of the zone to a value corresponding to the center position of the zone. Next step SP5 follows.

  Then, after moving the optical pickup 5 to the head position of the access data in step SP5, the CPU 2 moves to step SP6 and executes access to the access data. When the access is completed, the CPU 2 returns to step SP1 and starts a new read / write command. Await.

  On the other hand, if it is determined in step SP7 that the head position of the access data is within the zone where the optical pickup 5 is currently located, the CPU 2 moves to step SP9.

  In step SP9, as shown in FIG. 5, the CPU 2 moves to step SP5 without moving the zone and changing the linear velocity, moves the optical pickup 5 to the head position of the access data, and then moves to step SP6. Access to the access data is executed, and when the access is completed, the process returns to step SP1 to wait for a new read / write command.

(3) Operation and Effect In the above configuration, when the data amount of access data for the optical disc 100 is more than half of the zone data amount, the disk drive device 1 sets the head position of the zone as the head position of the access data. As a result, the disk drive device 1 minimizes the possibility that the optical pickup 5 moves across other zones during access to the access data, and reduces the access speed accompanying the movement of the optical pickup 5 between zones, An increase in power consumption due to a sudden change in the rotational speed can be reduced.

  Further, the disk drive device 1 has the center of the zone when the data amount of the access data is less than half of the zone data amount and the head position of the access data is outside the zone where the optical pickup 5 is currently located. Set the position to the beginning of the access data. As a result, the disk drive device 1 prevents the optical pickup 5 from moving across other zones during access to the access data, thereby reducing the access speed and the rotation speed associated with the movement of the optical pickup 5 between the zones. An increase in power consumption due to a sudden change can be reduced, and the access data can be accessed under optimum conditions.

  Further, the disk drive device 1 resets the zone when the data amount of the access data is less than half of the zone data amount and the head position of the access data is in the zone where the optical pickup 5 is currently located. The access data is accessed in the current zone without performing the operation. As a result, the disk drive device 1 can prevent unnecessary zone movement and reduce the increase in power consumption due to sudden changes in the rotational speed.

  According to the above configuration, the access speed to the optical disc 100 can be improved by adaptively setting the zone position based on the head position and the data amount of the access data.

(4) Other Embodiments In the above-described embodiment, the case where the present invention is applied to the disk drive device 100 that performs recording and reproduction with respect to the optical disk 100 has been described. However, the present invention is not limited to this. The present invention can also be applied to a disk drive device that performs only one of recording and reproduction on an optical disk.

  Furthermore, the present invention is not limited to an optical disk, and the present invention can also be applied to various disk drive devices that access various disk-shaped recording media such as a floppy (registered trademark) disk and a hard disk.

  In the above-described embodiment, when the amount of access data is more than half of the zone data amount, the head position of the zone is set as the head position of the access data, and the data amount of the access data is equal to the zone data amount. If it is less than half and the head position of the access data is outside the zone where the optical pickup 5 is currently located, the center position of the zone is set to the head position of the access data. However, it is not necessary to always move the head position of the zone to the head position of the access data, or always set the center position of the zone to the head position of the access data. What is necessary is just to change a position.

  The present invention can be applied to, for example, a disk drive device that performs recording / reproduction with respect to an optical disk.

It is a block diagram which shows the whole structure of a disk drive apparatus. It is a basic diagram with which it uses for description when the amount of access data is more than half of a zone. It is a characteristic curve figure with which it uses for description of linear velocity setting. It is a basic diagram with which it uses for description when the amount of access data is less than half of a zone. It is a basic diagram with which it uses for description when the amount of access data is less than half of a zone. It is a flowchart which shows a zone position setting process sequence. It is a basic diagram with which it uses for description of a CAV system. It is a basic diagram with which it uses for description of a CLV system. It is a basic diagram with which it uses for description of a ZCLV system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Disk drive apparatus, 2 ... CPU, 3 ... Disk controller, 4 ... Spindle motor, 5 ... Optical pick-up, 16 ... Analog signal processor, 20 ... Digital signal processor, 100 ... Optical disk.

Claims (7)

Data size sets the predetermined zone with respect to the disc-shaped recording medium, a disc drive apparatus for accessing one constant speed of within the zone,
Zone position setting means for setting the position of the zone based on the start position of the access data for the disc-shaped recording medium;
A linear velocity setting means for setting a linear velocity when accessing the zone according to the position of the zone set by the zone position setting means;
Drive means for rotationally driving the disk-shaped recording medium at the set linear velocity;
Lud disk drives device comprising an access means for performing access to said disc-shaped recording medium which is rotationally driven by the drive means. The zone position setting means sets the head position of the access data to the head position of the zone.
Disk drive device according to 請 Motomeko 1. The zone position setting means sets the head position of the access data as the head position of the zone when the data amount of the access data is more than half of the data size of the zone.
Disk drive according to 請 Motomeko 2. The zone position setting means sets the head position of the access data to the center position of the zone.
Disk drive device according to 請 Motomeko 1. The zone position setting means sets the head position of the access data to the center position of the zone when the data amount of the access data is less than half the data size of the zone.
Disk drive according to 請 Motomeko 4. The zone position setting means, once when accessing to the top position of the new the access data after setting the zone, the head position of the current position and the access data of the access means is in the same above zone When the above zone position is not set
Disk drive device according to 請 Motomeko 1. Data size sets the predetermined zone with respect to the disc-shaped recording medium, a disk access method for accessing one constant speed of within the zone,
A zone position setting step for setting the position of the zone based on the start position of the access data for the disk-shaped recording medium;
Depending on the position of the zone set in the zone position setting step, Lud I disk access method comprising the linear velocity setting step of setting a linear velocity at the time of accessing the zone.

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