JP2674668B2 - Disk device and its control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device, and more particularly to a disc device for reading a disc in which control data and user data are recorded in different formats such as an ISO-compliant optical disc.

The optical disk device has a very large recording capacity, and is expected to spread as a large-capacity recording device for electronic computer systems. The recording formats of optical discs vary from company to company, but in recent years standards such as ISO have been created.

[Prior Art] FIG. 6 shows a format of an optical disc conforming to ISO. The optical disk 6 is PEP zone 61 and SFP zone 6 from the inside.
2, the user zone 63 and the outer SFP zone 6.

The PEP zone 61 and the SFP zones 62 and 64 are control zones in which the data read first when the optical disc is mounted in the disc device is recorded. In the PEP zone 61, for example, the format type of the optical disc, the modulation type, the number of bytes of user data in one sector, the maximum limit of the read power when reading the SFP zone, and the like are recorded.

The same data is recorded in the SFP zone 62 and the outer SFP zone 64, and when the data in the SFP zone 62 cannot be read normally, the data in the outer SFP zone 64 is read. PFPF
Information necessary for the zone 61 to read the SFP zone 62 and the user zone 63 is recorded.

That is, when the optical disk 6 is mounted in the disk device, the disk device first reads the data of the PEP zone, initializes the device, for example, adjusts the intensity of the laser beam, formats the user zone in the control circuit for analyzing the digital reproduction signal. The format, modulation format, number of bytes of user data, etc. are set.

FIG. 8 shows the sector format of the PEP zone, and FIG. 9 shows the sector format of the user zone and the SEP zone. One sector of the PEP zone consists of 177 PEP bits, and PEP data is 144 PEP bits and other preambles and C
Data such as RC consists of 33 PEP bits. However, one PEP bit in the PEP zone consists of about 650 bits as shown in FIG.

One sector of the user zone and the SEP zone is composed of sector mark, VFO, address mark and other data and actual user data, and the length of the user data is the data length defined in the PEP zone.

Therefore, since the PEP zone and the data zone have different sector formats and are recorded with completely different modulation methods, it is not possible to analyze the data in both zones with the same circuit, and with a circuit that analyzes the data in the PEP zone. ,
A circuit for analyzing and processing the data in the data zone is separately configured. Usually, the data in the data zone is analyzed by the controller of the disk device, and the data in the PEP zone is analyzed by the MPU or the like, which is a control unit lower than the controller.

FIG. 10 is a block diagram of an optical disk device. The optical disc 1 is rotationally driven by a spindle motor (hereinafter abbreviated as SP motor) 2, and the SP motor 2 is controlled by a SP motor control circuit 60 so as to rotate at a constant speed. Optical head 3
Is driven by the voice coil motor 33 to move in the radial direction of the optical disc 1 to read data from a desired track on the optical disc 1. The reproduction signal from the head 3 is an analog signal obtained by photoelectrically converting the reflected light of the laser, and the pulsing circuit 76 converts the analog signal into a digital signal. The PEP bit detection circuit 77 is for demodulating PEP zone data.

Normally, the data read from the data zone is converted into a digital signal and then input to the control 5, and the controller 5 checks the format of the user zone and CRC.
Perform a check. Therefore, when the controller 5 analyzes the data of the PEP zone having different sector formats and modulation methods, an error occurs due to the format check and CRC check.

Therefore, the data of the PEP zone is converted into a digital signal and then input to the PEP bit detection circuit 77, and the PEP bit detection circuit 77 is, as shown in FIG. 5, "00110011" of the PEP zone.
Is detected as 1 and a reproduced signal in which "0000" is continuous is detected as 0. PEP bit detection circuit 7
The output of 7 is input to MPU4, MPU4 performs the PEP zone format check, stores the PEP zone data in the register in MPU4, and finally performs the CRC check.

When the PEP zone data is analyzed normally, MPU4
Sends a command for initializing the disk device to the controller 5 and the like. For example, the format format, modulation format, number of bytes of user data, etc. of the user zone are specified.

[Problems to be solved by the invention]

In recent years, the data processing speed and the data transfer speed have been increased, and it has become possible to increase the rotation speed of the optical disk in order to improve the reading speed of user data. However, if the reading speed of the user data is increased, the reading speed of the data in the PEP zone is also increased when the optical disk device is started, which exceeds the processing speed of the MPU.
The data in the zone may not be read correctly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disc device in which control zone data and user data are recorded in different recording formats, the control zone data can be accurately read, and the user zone data can be read at high speed. To do.

[Means for solving the problem]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, reference numeral 1 is a disk having a first recording zone 11 and a second recording zone having different data recording formats, 2 is a drive means for rotationally driving the disk 1, and 3 is a head for reading the data recorded on the disk 1. Reference numeral 5 is a first that analyzes the data in the first recording zone read from the head 4 and sends out necessary data.
The control means 5 is a second control means for analyzing the data of the second recording zone read from the head and sending out necessary data. The processing speed of the first control means is different.

According to the present invention, in a disc device, a drive unit that rotationally drives a disc having a first recording zone in which control information is recorded and a second recording zone having a recording format different from the first recording zone, A head for obtaining a reproduction signal of data recorded on the disc; first control means for processing the reproduction signal obtained from the first recording zone to obtain the control information; and the second recording zone. The reproduction signal obtained from the first recording medium is processed by a processing method different from that of the first recording medium, the second recording medium having a processing speed higher than the processing speed of the first recording medium, and the head recording the second recording medium. When reproducing the data of the zone, the disk is rotationally controlled at the first rotation speed corresponding to the processing speed of the second control means, and when reproducing the data of the first recording zone, The first The disc is rotated at a second rotation speed lower than the first rotation speed determined in correspondence with the processing speed of the first control means so that the control means can process the data of the first recording zone. And a rotation speed control means for controlling rotation.

Further, it further comprises initial setting means for performing initial setting of the disk device based on the control information obtained from the first recording zone, and the initial setting means, based on the control information, the intensity of the laser beam. Configure to make adjustments.

Further, the initial setting means is configured to set the recording method or the modulation method of the second recording zone to the second control means.

[Action]

The rotational speed of the disk during reading the second recording zone does not depend on the rotational speed of the disk during reading the first recording zone, and the disk can be rotated as fast as possible, that is, the conventional first recording zone reading. The disc rotation speed at the time is set so that the first control means can accurately read the data in the first recording zone, and the disc rotation speed at the time of reading the second recording zone is the second control means, the second recording zone. It is possible to increase the reading speed of the data in the second recording zone by setting the data so as to be accurate and as fast as possible.

〔Example〕

FIG. 2 is a block diagram of an embodiment of the optical disk device according to the present invention. In the figure, 1 is an optical disk having a PEP zone 11 and user data 12, and 2 is a spindle motor (hereinafter abbreviated as SP motor) for rotationally driving the optical disk 1. 6 is SP
A motor control circuit that controls the rotation of the SP motor 5, the rotation of the optical disc 1 at a constant speed by the index signal sent from the SP motor 2, and the rotation of the SP motor 5 at a high speed and a low speed by a command from a host. Control is performed. For example, the high speed rotation is 5400 rpm and the low speed rotation is 1800 rpm.

An optical head 3 moves in the radial direction of the disk 1 by the VCM 33. A small VCM 31 moves the lens of the optical head 3 in a minute range in the radial direction of the disk to follow the track. Also, 32 is a small VCM, which adjusts the distance between the lens of the disk 1 and the lens of the optical head 3 to adjust the focus of the optical head 3.
Servo signal creation circuit 71 is focus error signal (FES)
And a track error signal (TES) are created, and the VCMs 32 and 31 of the optical head 3 are controlled to perform focus servo and track servo. The VCM 33 is applied with the voltage value VCMi instructed by the MPU 4, and moves the optical head 3 to a desired position.

Reference numeral 36 denotes an inner sensor, which is mounted on the disc at a position corresponding to the PEP zone.
It is detected that it is located on the P zone. Reference numeral 71 is a pulse circuit, and 72 is a PEP bit detection circuit, which is similar to the conventional example.

The controller 5 analyzes the user data and sends the user data to the upper layer. The MPU 4 receives an instruction from the controller 5 and controls each circuit of the optical disk device. For example, when the optical head 3 moves to a desired track, connection or opening commands FS and TS are sent to the FES and TES switches 72 and 74 to control the servo on / off. Further, the drive current value MCMi is sent to the VCM 33, and the SP4 motor control circuit 6 is sent a command to turn the SP motor on and off and a command to switch the motor rotation speed to high speed or low speed rotation.

Next, the operation of this embodiment will be described with reference to FIG. When the optical disk is mounted on the disk device, the MP
U4 sends a command to the SP motor control circuit 6 to rotate the SP motor 2 and rotate it at a low speed, for example, 1800 rpm. In the next step, the MPU 4 moves the VCM 33 so that the optical head 3 is located on the PEP zone, that is, until the inner sensor 36 is turned on. In the next step, MPU4 turns on FS to perform focus servo, and turns off TS to disable track servo. Unlike the Daeda zone, the PEP zone does not have spiral grooves, so there is no need to perform track servo. And in the step, MPU4 performs the reading process of the PEP zone, and if the data of the PEP zone can be read accurately,
The MPU 4 sends the SP motor 2 to the SP motor control circuit 6 at a high speed, for example 54
Send the command SPhi to rotate at 00 rpm.

Next, details of the PEP zone reading process will be described with reference to FIG. In the step, MPU4 first detects the PEP zone gap. That is, this is the case where the PEP bit detection circuit 77 outputs 0 for a predetermined time or longer. Next step
Detects all 0 preambles whose MPU4 value is 6 PEP bits. Since one bit of the PEP zone has a structure as shown in FIG. 8, the MPU 4 detects that the PEP bit detection circuit 7 outputs 0 for a predetermined time or more, and then 1 and 0 are alternately changed to 6
It is detected consecutively. At this time, the MPU 4 detects the timing of 1 PEP bit, and at that timing, when the output of the PEP bit detection circuit 77 changes from 1 to 0, the PEP data is 0, and conversely when the output changes from 0 to 1, the PEP data is 1 To detect.

In the next step, MPU4 has 1PEP bit value of 1.
Detect SYC signal. After that, MPU4 sends 8PEP bit sector number, 144PEP bit PEP information, and 8PEP bit CRC.
Are sequentially detected. It is used to store 20 PEP bit data detected in the 8-bit register built in MPU4.

In the figure, A is a bit number in the register, B is a register number, and A and B are initialized in step and.
In the step, the MPU 4 stores the read PEP bit data in the position indicated by the bit number A and the register number B. When loop a ends, PEP data is stored in one register, and when loop b ends, all PEP data is stored.

Finally in step MPU4 CRC of stored PEP data
Is calculated and compared with the read CRC, and if they match, the reading of the PEP data ends. If they also do not match, PE
Re-read the P data.

According to this embodiment, the read processing speed of user data is
The reading speed of the PEP data does not depend on the reading speed of the user zone, the rotation speed of the optical disk is set as high as possible in order to read the data at high speed, and when reading the PEP data, P
The rotation speed of the disc can be set to ensure that the EP data can be read.

〔The invention's effect〕

According to the present invention, the data in the first recording zone (control zone) can be reliably read, and the data in the second recording zone (user zone) can be read at high speed, so that the rotation speed of the disk is as high as possible. It can be rotated. In addition, no special circuit is provided to analyze the data in the first recording zone.
Since the data of the first recording zone is processed by a processor such as, the disk device according to the present invention can be easily implemented.

[Brief description of the drawings]

 FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is an operation explanation flow of an embodiment of the present invention, and FIG. 4 is a data reading processing flow of a PEP zone, Fig. 5 is a read waveform diagram of data in the PEP zone, Fig. 6 is an optical disc format, Fig. 7 is a block diagram of bit cells in the PEP zone, Fig. 8 is a sector format of the PEP zone, and Fig. 9 is a user zone. Sector format, FIG. 10 is a block diagram of a conventional disk device. In the figure, 1 ... Disk 11 ... First recording zone (control zone) 12 ... Second recording zone (user zone) 2 ... Driving means 3 ... Head 4 ... First control means (micro) Processor) 5 ... Second control means (controller) 6 ... Rotation speed control means

Claims (6)

(57) [Claims] 1. A drive unit for rotationally driving a disc having a first recording zone in which control information is recorded and a second recording zone having a recording format different from that of the first recording zone; A head for obtaining a reproduction signal of recorded data, and processing the reproduction signal obtained from the first recording zone,
A first control means for acquiring the control information, and a reproduction signal obtained from the second recording zone for the first control means.
When the processing is performed by a processing method different from that of the control means, the second control means has a processing speed higher than that of the first control means, and the head reproduces the data of the second recording zone, When the disk is rotationally controlled at a first rotation speed corresponding to the processing speed of the second control means and the data in the first recording zone is reproduced, the first control means is operated by the first control means. Second slower than the first rotation speed determined corresponding to the processing speed of the first control means adapted to process the data of the recording zone
And a rotation speed control means for controlling rotation of the disk at a rotation speed of. 2. The apparatus further comprises initial setting means for performing initial setting of the disk device based on the control information obtained from the first recording zone, the initial setting means based on the control information. The disk device according to claim 1, wherein the intensity of the beam is adjusted. 3. The apparatus further comprises initial setting means for performing initial setting of the disk device based on the control information obtained from the first recording zone, wherein the initial setting means is the second control means. 2. The disk device according to claim 1, wherein the recording method or the modulation method of the second recording zone is set. 4. A drive unit for rotationally driving a disc having a first recording zone in which control information is recorded and a second recording zone having a recording format different from that of the first recording zone; A head for obtaining a reproduction signal of recorded data, and processing the reproduction signal obtained from the first recording zone,
A first control means for acquiring the control information, and a reproduction signal obtained from the second recording zone for the first control means.
Second control means, which has a processing speed different from the processing speed of the first control means, and a second rotation speed faster than the first rotation speed and the first rotation speed. And a rotational speed control means for driving and controlling the drive means, wherein when the head reproduces data in the first recording zone, the rotational speed control means includes the first control means for the first control zone. Drive the drive means at the first rotation speed corresponding to the processing speed of the first control means so that the data in the recording zone can be processed. When performing reproduction, the rotation speed control means drives the drive means at the first rotation speed higher than the second rotation speed corresponding to the processing speed of the second control means. Device control method 5. The apparatus further comprises initial setting means for performing an initial setting of the disk device based on the control information obtained from the first recording zone, the initial setting means comprising a laser based on the control information. 5. The method according to claim 4, wherein the beam intensity is adjusted. 6. The apparatus further comprises initial setting means for initializing the disk device based on the control information obtained from the first recording zone, wherein the initial setting means is the second control means. 5. The method of controlling a disk device according to claim 4, wherein the recording method or the modulation method of the second recording zone is set.