JPH07235058A - Optical disk device - Google Patents

Abstract

PURPOSE:To provide an optical disk device capable of reproducing an optical disk medium recording the data with a higher recording density in spite of being a sample servo system. CONSTITUTION:A servo clock generation means 1419 and a data clock generation means 1420 are arranged for dividing a means generating a reference clock into two systems of a servo use and a data use. Further, as an optical disk 10, the medium where servo marks are formed beforehand from a center radially in the sample servo system state is used. The optical disk medium 10 is rotated at a fixed angular speed by a rotation means 1402. The servo clock generation means 1419 divides a servo mark signal detected by a reproducing optical head 1403 at a beforehand decided fixed ratio to generate a clock signal with a fixed frequency. The data clock generation means 1420 generates the clock signal whose frequency is variable by dividing the servo mark signal detected by the reproducing optical head at the ratio set by a control means 1403.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for recording or reproducing information by irradiating an information track recorded concentrically or spirally on a disk-shaped recording medium with convergent laser light. .

[0002]

2. Description of the Related Art In recent years, personal computers and workstations, represented by personal computers and workstations, have been remarkably enhanced in performance, and the amount of information handled has dramatically increased from character information to voice and images. As a memory device of these personal information processing devices, there is an increasing demand for an optical disc having a large capacity and a low bit cost.

Optical discs include a read-only type, a write-once type, and a rewritable type. The reproduction-only type, which is represented by a compact disc, has recording information recorded in a concave-convex shape on a substrate by a stamper or the like, and thus an optical disc medium can be supplied inexpensively and in large quantities. For compact discs, it is important to increase the storage capacity rather than the access time so that it is suitable for playing music, and CLV (Constant Linear V)
The information is reproduced by the "elocation" method. On the other hand, the write-once and rewritable type optical disks record information by heating a thin film of a recording material by laser light irradiation to cause pit formation, phase change or magnetization reversal. These are CAVs (Constant Angular Vel) capable of high-speed access suitable for an external memory of a computer as represented by a 3.5-inch magneto-optical disk.
system) is used. An example of such an optical disc is the one shown on pages 120 to 133 of Nikkei Byte 1992.

Since the linear velocity of rotation is constant in the CLV type optical disc, the linear density of recorded information is equal and it is effective for increasing the capacity of the disc, but the number of revolutions of the disc is continuously changed depending on the track. There is a need. Therefore, it is necessary to change the rotational speed of the disk for each track, and there is a limit to the acceleration and deceleration of the rotational speed of the disk due to the rotational inertia of the disk, so the access time is limited.

The CAV type optical disc is effective in shortening the access time because the disc rotation speed is constant, but the information recording density decreases in inverse proportion to the radius, and the disc capacity is smaller than that of the CLV type. Then it becomes about 2/3.

Therefore, the optical disk medium is divided into a plurality of concentric or spiral zones, and each zone has a ZCAV (Zoned) for making the recording density substantially constant as in the CLV system.
Constant Angular Velocity
y) method is effective. The ZCAV system has a merit that the access speed is high because the optical disk medium has a constant rotation speed, and the linear density of recorded information is substantially constant for each zone, so that the disk capacity can be as large as the CLV system.

An MCAV (Modulate Constant) for changing the recording / reproducing timing according to the track position while rotating the optical disk at a constant speed.
The t Angular Velocity) method is also known as a recording method for improving the recording density. JP 62
Japanese Patent Publication No. 80865 proposes an optical disk device which can handle both MCAV and CAV systems by arranging a means for changing the frequency of a reference clock according to the track position.

[0008]

As described above, the CAV
The method has a problem that the storage capacity is small, but on the other hand, the CAV method employs a sample servo method which simplifies the configuration of the optical system and is advantageous for downsizing the apparatus. The sample servo method can detect data, a focus error, and a tracking error by detecting servo marks radially preformatted on the optical disk and time-dividing the detection signals of the servo marks.

On the other hand, in the ZCAV system and the MCAV system, it is necessary to change the frequency of the reference clock for each zone or track. Therefore, if the sample servo method is adopted for the ZCAV method or the MCAV method, the servo mark can be detected at a predetermined timing when accessing the adjacent zone from one zone and when accessing the adjacent track from the track. There is a risk of disappearing. When the servo mark cannot be detected in the sample servo system, recording and reproduction, let alone the light beam cannot follow the track. Therefore, the conventional ZCAV system and MCAV system use a continuous servo system in which a groove-shaped track is formed in advance and tracking servo is performed by detecting the groove.

It is an object of the present invention to provide an optical disk device capable of reproducing an optical disk medium in which data is recorded at a high recording density even though it is a sample servo system.

[0011]

In the present invention, a rotating means for rotating an optical disk medium having servo marks pre-formed radially from the center in a sample servo system at a constant speed, and recorded on the optical disk medium. An optical disk device equipped with a reproducing optical head that detects a mark and converts it into a signal is divided into servo signal signals detected by the reproducing optical head at a predetermined constant ratio, and the reproducing optical head is tracked. And a data for generating a clock signal for reproducing data on the optical disc by dividing the servo mark signal detected by the reproducing optical head at a specified ratio. The optical head for reproduction detects the mark at which position on the optical disc medium the clock generating means and the reproducing optical head detect. Depending on the position, by a control means for instructing the ratio data clock generating means, it is intended to accomplish the above object.

When the reproducing optical head is located on the outer peripheral side of the optical disc medium, the control means determines that the ratio is
The data clock generating means can be instructed to have a value equal to or higher than the ratio when it is located on the inner peripheral side.

[0013]

In the optical disk device of the present invention, the means for generating the reference clock is divided into two systems, one for servo and the other for data. Further, as the optical disk medium, there is used a sample servo system mode in which servo marks are preliminarily formed radially from the center. The optical disc medium is rotated by the rotating means at a constant angular velocity.

The servo clock generating means for generating a clock signal for controlling the tracking of the reproducing optical head divides the servo mark signal detected by the reproducing optical head at a predetermined constant ratio. The rotation speeds of the optical disk medium are constant, and the servo marks are arranged radially from the center, so that a clock signal having a constant frequency is generated. Therefore, by using the clock signal having the constant frequency, the tracking error signal can be generated without losing the servo mark.

The data clock generating means for generating a clock signal for reproducing the data on the optical disk divides the servo mark signal detected by the reproducing optical head by the ratio set in the control means, thereby changing the frequency. Generates a variable clock signal. Therefore, by changing the division ratio set in the data clock generating means according to the linear recording density of the optical disc medium, even if the optical disc medium has different recording densities per rotation angle of the data, the linear recording density can be adjusted according to the linear recording density. A clock signal can be generated. Therefore, it becomes possible to reproduce the data of the optical disk medium having different recording densities per rotation angle of the data. The recording density can be increased by increasing the recording density per rotation angle toward the outer peripheral side of the optical disk medium. The optical disk device of the present invention can cope with this.

The control means detects whether the reproducing optical head is detecting a mark on the optical disk medium, thereby checking whether the reproducing optical head is located on the outer peripheral side or the inner peripheral side. , The data clock generating means is instructed of the ratio matching the position.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk device according to an embodiment of the present invention will be described below with reference to the drawings.

The optical disk device of this embodiment is connected to a host computer 80 via an interface 1427 as shown in FIG. Interface 142
For example, a SCSI interface or the like can be used as 7. The optical disk device 70 receives the data via the interface 1427 and records it on the optical disk medium 10. In addition, the data on the optical disk medium 10 is reproduced, and this is transferred to the host computer 80.

The structure of the optical disk device of the first embodiment of the present invention which can be used as the optical disk device 70 of FIG. 7 will be described with reference to FIG.

As shown in FIG. 3, the optical disc apparatus of the first embodiment comprises a support portion 601 which detachably holds the phase-change rewritable optical disc medium 10. Support part 601
A spindle motor 1402 is connected to the. The spindle motor 1402 rotationally drives the optical disc medium 10 at a center value of 3600 rpm. A rotation speed control unit 1405 that controls the rotation speed of the spindle motor 1402 is connected to the spindle motor 102. The rotation speed control unit 1405 is connected to the drive controller 1428.

On the lower surface side of the optical disk medium 10,
An optical head 1403 for recording / reproducing information on / from the optical disc medium 10 is arranged. This optical head 140
Reference numeral 3 denotes a semiconductor laser light source, an optical system including an objective lens that focuses the laser light on the optical disc medium 10, a photodetector that detects the amount of light reflected from the optical disc medium 10 by the laser irradiation light, and the irradiation position of the laser light follows the track. To move the objective lens in the radial direction of the optical disc medium, and a focus actuator that drives the objective lens in the optical axis direction of the laser beam in order to make the focal position of the laser beam follow the surface of the optical disc medium 10. Built-in actuator etc. Further, the optical head 1403 is the same as the optical head 1403.
A course actuator 1404 for moving in the radial direction of 0 is attached.

A preamplifier 1408, a laser driver 1407, and an actuator driver 1409 are connected to the optical head 1403.

The preamplifier 1408 includes a pit extractor 1
413, data detector 1415, address detector 141
2. The error detector 1411 is connected.

The pit extractor 1413 extracts a reproduction signal waveform corresponding to a pit in the servo mark area 100 (FIG. 1) on the optical disk medium 10 and a reproduction signal waveform corresponding to a mark in the data area 157. The pit extractor 1413 divides the timing of the clock pits 102 in the servo mark area 100 by a predetermined fixed ratio to generate a servo clock.
(Hase Locked Loop) 1419 and a data system PLL 1420 that generates a data clock by dividing the timing of the clock pit 102 at a set ratio.
And are connected.

The data detector 1415 has a data system PL.
The data clock signal output from L1420 is input. The data detector 1415 causes the preamplifier 140 to perform the discrimination timing according to the data clock signal.
8 outputs are discriminated. A demodulator 1421 and an error corrector 1426 are sequentially connected to the data detector 1415. The demodulator 1421 reproduces the data written in the data area 157 from the output of the data detector 1415. The error corrector 1426 corrects an error in the data demodulated by the demodulator 1421 and the data to be recorded received from the host computer 80. Error corrector 1
An interface 1427 is arranged between the 426 and the host computer 80. A modulator 1416 is connected to the error corrector 1426. The data to be recorded by the error corrector 1426 from the host computer 80 on the optical disk medium 10 is input to the modulator 1416. The modulator 1426 synchronizes the data to be recorded with the data clock signal, generates a recording command signal, and outputs the recording command signal to the laser driver 1407.

The address detector 1412 detects the sector management information by synchronizing the reproduction signal waveform of the sector management information section 21 of the optical disk medium 10 with the servo clock signal. The detected sector management information is input to the drive controller 1428.

The drive controller 1428 has a table showing the relationship between the track number and the zone number of the optical disk medium 10 and the zone number and the data system PLL.
A table representing the relationship with the frequency division ratio of 1420 is stored in advance. The drive controller 1428 uses these tables and the track numbers recorded in the sector management information unit 21 of the optical disc medium 10 to determine the division ratio of the data system PLL 1420, and the division ratio setting unit 14
Output to 25. The division ratio setting unit 1425 uses the data system P
The frequency division ratio is set in LL1420.

The error detector 1411 extracts the deviation of the focus control signal and the deviation of the tracking control wobble pit 101 signal in synchronization with the servo clock signal. The controller 1418 reduces these deviations to 0.
As described above, the actuator driver 1409 is controlled to control the focus and tracking of the two-dimensional actuator in the optical head 1403.

A sector management information adder 1422 is arranged between the drive controller 1428 and the laser driver 1407. Sector management information adder 1
In response to an instruction from the drive controller 1428, the reference numeral 422 forms a signal representing information indicating that the data recording method of the data area 157 of the optical disc medium 10 is the zone method peculiar to the present embodiment, and the optical disc medium 10 has a signal. The sector management information section 21 is additionally written. If the data recording method is the conventional CAV method, nothing is additionally written.

Next, the optical disc medium 10 will be further described with reference to FIG.

The optical disk medium 10 of this embodiment has a diameter of 6
4 mm, the diameter of the innermost circumference of the recording area is 30 mm, and the diameter of the outermost circumference is 60 mm.

As shown in FIG. 8, the optical disk medium 10 includes SiN, AlN, Zn having a refractive index of about 2 on a transparent substrate 1610 made of glass, polycarbonate, PMMA or the like.
First interference film 1620 of transparent dielectric such as S, InSbTe
Alternatively, an overwritable recording film 16 such as GeSbTe
30, transparent second dielectric interference film 1 similar to the first interference film 1
640, metal reflection film 1650 such as Au, Al, etc., SiO ₂
Alternatively, the protective film 1660 formed of UV resin or the like is sequentially stacked. The optical disc medium 10 is a laser beam.
New information can be directly overwritten on the previous information only by irradiating the system.

In the optical disk medium 10, a spiral track 20 (in FIG. 1A, only one track is shown in a circular shape), a sector management information section 21, and a disk ID 40 are formed on the substrate. The uneven shape is pre-formatted. Here, the disk medium 10 is divided into 16 sectors 3
It is divided into 0s, and the sector management information unit 21 is arranged for each sector 30. Further, each sector 30 is divided into 43 segments 120. One segment consists of a servo mark area 100 and a data mark as shown in FIG.
Data area 157 and is continuously formed on the track 20. In the servo mark area 100, wobble pits 101 for tracking servo and clock pits 102 for a reference clock of the recording / reproducing circuit are preformatted. Similar to the conventional optical disk medium preformatted by the CAV method, as shown in FIG. 2, the servo mark area 100 is located radially from the center of the optical disk medium 10.

In the disc ID 40, the parameters necessary for operating the optical disc device are preformatted by the prescribed disc rotation speed and modulation frequency. The parameters include information such as the type of medium, reflectance, recording sensitivity, etc. as attributes of the disk medium 10.
These parameters are read and processed by the drive controller 1428 at the time of initialization or disc insertion.

The sector address information section 21 is preformatted with various information including a track number, a sector number, and a sector identification mark.

Further, the optical disk medium 10 of this embodiment is
The servo mark area 100 is located radially from the center of the optical disc medium 10 as in the conventional CAV preformatted optical disc medium, but on the other hand, as shown in FIG. 2, as in the conventional ZCAV system. The optical disk medium 10 is divided into nine zones at equal intervals from the inner circumference to the outer circumference. Zone numbers are 1 to 9 from the inner circumference to the outer circumference.
Up to. In the innermost zone # 1, N bytes of data are recorded per segment. The number of zone divisions is n = 9
Then, N + N / (n-1) bytes of data are recorded in the adjacent zone # 2. Similarly, in the outermost zone # 9, data of 2N bytes per segment is recorded. Thus, the linear recording density of the data for each segment 120 can be made substantially constant by increasing the storage capacity per segment toward the outer peripheral zone. The number of recorded bytes of data per segment depends on the modulation method. When the shortest mark length is set to about 0.6 μm and 8-10 modulation is adopted, N = 24 bytes of data can be recorded per segment in the innermost zone # 1. When the track pitch is 1.5 μm, the total storage capacity of the optical disk medium is about 110 MB when recorded by the CAV method.
However, by changing the recording data amount per segment for each zone as in the present embodiment, about 160M is obtained.
Increase to B.

Next, the operation of the optical disk device of this embodiment will be described.

As described above, in this embodiment, the servo mark areas 100 are radially arranged on the optical disk medium 10 to adopt the sample servo format, and
The recordable area is concentrically divided into 9 zones and 1
The amount of data recorded per segment is changed for each zone, and the linear recording density of data for each segment is made substantially constant between the inner zone and the outer zone of the optical disc. The rotational angular velocity of the optical disc medium 10 is
Keep constant regardless of zone.

When the sample servo format is adopted for the optical disk medium, the recording data and the tracking error signal can be obtained by processing one detection signal by temporally dividing it. Therefore, there is an advantage that the optical system of the optical head for recording and reproducing becomes simple. On the other hand, if the servo mark cannot be detected at a predetermined timing, not only the data recording / reproducing but also the optical beam cannot follow the track. In the conventional ZCAV system, since the sectors and segments have almost constant linear recording densities, the recording capacity can be increased, but when accessing from one zone to the adjacent zone, the servo is used. It is necessary to discretely change the frequency of the system reference clock. Therefore, if the sample servo format is adopted in the conventional ZCAV system, it becomes difficult to make the optical beam follow the track. However, in this example,
By making the servo clock for reading the servo mark and the data clock for reading the data separate systems, the servo mark areas 100 are radially arranged in the same manner as in the conventional CAV method, and the reference clock of the servo system is used. Zones are arranged while keeping the frequency constant, and it is possible to change the amount of data recorded per segment for each zone.

First, the operation of reproducing data from the optical disk medium 10 using the optical disk device of this embodiment will be described. These operations are performed by the drive controller 1
428 is performed by instructing each unit to operate.
The operation of the drive controller 1428 is controlled by the built-in microprocessor.

The drive controller 1428 operates the laser driver 1407 to read the disc ID 40 of the optical disc medium 10. Laser driver 1407
Causes the semiconductor laser of the optical head 1403 to light up, whereby the reproduction light is irradiated onto the optical disk medium 70.
The reflected light from the optical disc medium 10 is converted into an electric signal by a photodetector in the optical head 1403, and is amplified by a preamplifier 1408 to reproduce recorded information on the optical disc medium 10 as an RF signal. Then, from the amplitude pattern of the RF signal, the pit extractor 1
413 performs pit extraction, and servo system PLL1419
Divides the signal of the clock pit 102 by a predetermined fixed ratio to generate a servo system reference clock (servo clock signal). Servo system PLL1
419 has a fixed number of divisions (frequency division ratio) in the feedback loop so as to generate a reference clock having a constant frequency.

The error detector 1411 reproduces the focus and tracking servo signals based on the servo clock signal. The controller 1418 controls the actuator driver 14 so that these deviations become zero.
Two-dimensional actuator in the optical head 1403 via
Focus and tracking control of the controller.

The address detector 1412 has sector management information such as track numbers and sector numbers recorded in the sector management information section 21 on the basis of the servo clock signal.
Also, the data recording method additionally recorded in the sector management information section 21 is reproduced. When the data recording method is a signal indicating information indicating the zone method peculiar to the present embodiment, the drive controller 1428 determines the table showing the relationship between the built-in track number and the zone number, and the zone number and the data. It is necessary to use the table showing the relationship with the frequency division ratio of the system PLL 1420 to determine which zone the track belongs to from the track number and to generate the data clock for reproducing the data in the data area 157 of the zone. The frequency division ratio of the data system PLL 1420 is calculated and output to the frequency division ratio setting unit 1425. The division ratio setting unit 1425 sets the division ratio in the data system PLL 1420.

When the sector management information section 21 does not record a mark indicating that it is recorded in the zone system peculiar to this embodiment, the drive controller 142 is used.
In No. 8, it is determined that the data is recorded by the CAV method. When the data recording method is the conventional CAV method, the servo system PLL 1419 is used regardless of the track number.
The frequency division ratio that is equal to the frequency division ratio that is set to is output to the frequency division ratio setting unit 1425. Drive controller 1428
The table stored in advance defines the frequency division ratio of the data system PLL 1420 so that the recording density shown in FIG.

The data system PLL 1420 divides the signal timing of the clock pit 102 by the set frequency division ratio to generate a reference clock (data clock signal) for data.

When data is reproduced by the zone system peculiar to this embodiment, the number of divisions (frequency division ratio) in the feedback loop of the data system PLL 1424 differs for each zone. On the other hand, when reproducing data by the CAV method, a data clock equal to the servo clock is output from the data PLL 1424 regardless of the track number, so recording on the optical disk medium 10 easily recorded by the CAV method. Playback can be realized.

In the case of recording data on the optical disc medium 10 in the optical disc device of the present embodiment, FIG.
As described above, the optical disk medium 10 is initialized.

As shown in FIG. 11, first in step 501,
The drive controller 1428 receives, via the host computer 80, the user's designation of whether to perform recording using the conventional CAV method or the zone method unique to this embodiment. In this case, the host computer 80 asks the user how many megabytes the storage capacity of the optical disk medium 10 is when recording by the CAV method and how many megabytes when the recording is performed by the zone method peculiar to this embodiment. Can be configured to be displayed on the display device. In the next step 502, the disc ID 40 is read from the optical disc medium 10 by the same operation as the above-mentioned reproduction.
When an instruction to record in the zone method is received from the user in step 501, a signal indicating recording in the zone method and a position to additionally write this signal are determined (step 5).
04). In step 505, recording in the zone system is displayed on the display device of the host computer 80.
Then, when confirmation is obtained from the user (step 50)
In 6), information indicating that the recording is performed by the zone method is additionally written in the sector information management unit 21.

When the user specifies to record in the CAV method in step 501, the disc ID 40 is read (step 508) and confirmed to the user (step 509). No additional recording is performed on the sector management information 21.

Then, as in the above-described reproduction, the servo system PLL 1419 generates a servo clock signal, and the address detection unit 1412 detects the track number using this servo clock signal.

When recording is performed in the zone system, the drive controller 1428 determines the frequency division ratio for each zone from the track number as in the above-described reproduction, and the data system PLL 1420 generates the data clock signal. The modulator 1416 forms a signal representing the information to be recorded in the data area 157 in synchronization with the data clock signal,
The data is delivered to the laser driver 1407 and recorded on the optical disc medium 10 by the optical head 1403. This allows
The frequency of the data clock signal changes for each zone, and data is recorded in the data area 157 at the linear recording density as shown in FIG.

When performing recording by the CAV method, the drive controller 1428 sets the same frequency division ratio as the frequency division ratio set in the servo system PLL 1419 to the data system PLL 142.
Set to 0. As a result, the frequency of the data clock signal is always constant regardless of the track number, and data is recorded in the data area 157 by the CAV method.

As described above, in the optical disc apparatus of the present embodiment, the optical disc medium 10 in which the pre-formatted servo marks 100 are arranged radially from the center of the optical disc medium 10 is used, and the conventional CAV system is used. In the same manner as the above, the servo clock can be formed by the sample servo method by rotating at a constant rotation angular velocity. Therefore, since the frequency of the servo clock is constant in all tracks, there is an advantage that the servo mark can be easily detected in all tracks, and the light beam can easily follow the tracks. It has the advantage of being simple.

On the other hand, in the optical disk device of this embodiment, the servo clock signal and the data clock signal are separated, so that the linear recording density is almost constant between zones.
It is possible to arrange zones of the recording method peculiar to this embodiment. The data clock signal is formed by dividing the signal of the clock pit by a different division ratio for each zone. With this configuration, the servo clock is constant even when the optical head passes through the boundary between the two zones, so that the servo mark can always be followed and the optical beam follows the track. Is possible. Moreover, since the linear recording density of data is almost constant for each zone independently of the servo mark, the storage capacity can be increased as compared with the conventional CAV.

Further, the optical disc apparatus of the present embodiment can selectively use the conventional CAV system and the zone system peculiar to the present embodiment as the recording / reproducing system of the optical disc medium 10 according to the preference of the user. There are advantages. Further, as the optical disk medium 10, the one in which the servo mark area 100 is radially pre-formatted from the center by the conventional CAV method can be used as it is. Therefore, the optical disc medium 10 recorded by the conventional CAV type optical disc device can be reproduced by the CAV type by the optical disc device of the present embodiment. Also,
Recording can be performed on the optical disk medium 10 preformatted by the conventional CAV method by the optical disk device of the present embodiment by the zone method peculiar to the present embodiment. Further, in the optical disc device of the present embodiment, it is possible to reproduce the optical disc medium 10 recorded by the CAV method with the conventional optical disc device.

Although the optical disk medium 10 is equally divided into nine zones in the above embodiment, the present invention is not limited to this, and the optical disk medium 10 may be equally divided into a number of zones designated by the user. Is also possible. In this case, the table in the drive controller 1428 is stored in advance for each number of zones that can be designated. Then, in step 501 of FIG. 11, when the user accepts the zone method, the user is configured to accept the number of zones to be divided. Then, the number of divisions of the accepted zone is calculated in step 507 of FIG.
In addition to adding 0, the frequency division ratio for generating a data clock at the time of recording / reproducing is set to the drive controller 1428.
When setting, the table corresponding to the number of divisions of the additionally written zone is used.

FIG. 4 shows a zone for one optical disk medium.
It is an estimate of the relationship between the number of partitions and the storage capacity of the disk. The calculation condition is that the diameter of the optical disk medium is 6
5 mm, data area 30 to 60 mmφ, servo system sample servo, disk rotation speed center value 3600 r
pm, data modulation method is 8-10 modulation, data basic pulse width is 90 ns, and storage capacity per sector is 51
Each zone has 2 bytes, and each zone is equally divided in the radial direction of the optical disk medium. In the figure, when the number of zones is 1, the conventional CAV method is shown. As shown in FIG. 4, the total storage capacity of the disk increases as the number of zone divisions increases, but when the number of zone divisions becomes 10 or more, it becomes a substantially constant value at about 170 MB.

As described above, this embodiment uses the optical disk medium 10 in which the sector management information section 21 and the servo mark area 100 are preformatted. The capacity per physical sector 30 increases zone by zone from the inner track to the outer track. 512 bytes or 1 logical sector for personal computers
Since it is desired to be constant at 024 bytes, it is possible to provide the demodulator 1421 and the modulator 1416 with a function of converting a physical sector that changes for each zone to a fixed-length logical sector.

In this case, a method of partitioning the logical sector for each track, and a method of partitioning for each zone can be considered.

When a logical sector is divided for each track, the track is divided into 512 bytes or 1024 bytes while straddling the physical sector 30, and one partition is defined as a logical sector, 512 bytes or 1024 bytes. Recording is not performed on the last sector that does not meet. This method has the advantage that logical sectors are not arranged across tracks.

When the logical sector is divided into zones, one track is divided into 512 bytes or 1024 bytes while straddling the physical sector 30, and one division is defined as a logical sector, 512 bytes or 1024 bytes. 512 bytes or 1 is added to the last unsatisfied sector by adding the first capacity of the next track.
It is set to 024 bytes, and this is one logical sector.
This is repeated for the tracks in one zone, and 512 bytes or 1 at the end of the outermost track of one zone.
Recording is not performed in the sector that is less than 024 bytes. According to this method, although the logical sectors are arranged across tracks, the tracks are arranged in a spiral shape, and if the tracks are within one zone, the data clock signal has the same frequency. In the case of the method, since no access time between tracks is required, no problem occurs. Further, since there is at most one logical sector in which recording is not performed for each zone, there is an advantage that the capacity is not wasted. In the case of recording by the zone method peculiar to this embodiment, the frequency of the data clock signal changes between zones, but since the logical sector is not arranged across the zones, the data clock signal changes in the middle of the logical sector. It does not happen.

Next, an optical disk device according to the second embodiment of the present invention will be described with reference to the drawings.

In the optical disk device of FIG. 3 of the first embodiment described above, the optical disk medium 10 was equally divided into nine zones, but the present invention is not limited to this, and the optical disk medium 10 is not limited to this.
Can be divided into zones of a capacity designated by the user at initialization.

In a general MSDOS personal computer, C
Due to the limitation of the PU address space, it is desirable that the capacity be about 32 MB or less in order to recognize the disk as one area. For this reason, a method is widely used in which a disk is divided into several partitions and each partition is handled as a separate device. Therefore, in an optical disc medium having a storage capacity of 100 MB or more, it is preferable that the partition and the zone correspond to each other 1: 1. If the partition is formed over zones, the frequency of the data system reference clock (data clock signal) must be switched between zones, so the clock is stable in some cases. It may take some time before and the effective access time may be delayed. Matching the partition and the zone in this way can be realized by dividing the optical disk medium 10 into zones having a capacity designated by the user at the time of initialization.

Further, in the optical disk device of FIG. 3, since the sector management information section 21 is configured to use the pre-formatted optical disk medium 10, the demodulator 1421 and the modulation function for converting the physical sector into the logical sector are provided. Although it has been shown that the device 1416 can be provided,
By using the optical disc medium 10 in which the sector management information unit 21 is not pre-formatted and additionally writing the sector management information unit 21 at the time of initialization, conversion between the logical sector and the physical sector can be made unnecessary.

A structure for dividing the optical disk medium 10 into zones having a capacity designated by the user at the time of initialization and a sector address added at the time of initialization make conversion between the logical sector and the physical sector unnecessary. An optical disk device that simultaneously realizes the above configuration will be described with reference to FIG.

The optical disk device of the embodiment shown in FIG.
The configuration is almost the same as that of the optical disk device shown in FIG. 3, but a sector setting device 1417 and a data area setting device 1410 are arranged in place of the sector management information additional recording device 1422 of FIG. The data area setter 1410 includes a servo system PLL.
A servo clock signal is input from 1419. The sector setter 1417 generates a signal representing sector management information to be additionally recorded on the optical disc medium 10 in response to an instruction from the drive controller 1428. Data area setter 141
0 indicates the sector management information generated by the sector setting unit 1417 by determining the position to write the sector management information by counting the servo clock signal according to the instruction from the drive controller 1428 via the sector setting unit 1417. The signal is delivered to the laser driver 1407.

The operation of the optical disk device shown in FIG. 12 will be described.

Since the operation for reproducing the optical disk medium 10 is the same as that of the optical disk device of FIG. 3, its explanation is omitted. However, the table in the drive controller 1428 is not stored in advance, but is created by the drive controller 1428 when the optical disk medium 10 is initialized.

The initialization operation when recording on the optical disk medium 10 is different from that of the optical disk device of FIG. This will be described with reference to FIG.

As shown in FIG. 5, first in step 1501,
A user's designation of whether to perform the conventional CAV method or the zone method peculiar to this embodiment is received.
In the case of the CAV method, the capacity per logical sector is further accepted. In the case of the zone method,
The drive controller 1428 receives, via the host computer 80, how many zones are set, the capacity of each zone, and the capacity of one logical sector. (However, the partition and the zone are in a 1: 1 correspondence.) As for this receiving method, for example, the storage capacity of the optical disk medium 10 when recording to the user by the CAV method is several megabytes. It can be configured to display how many megabytes are recorded on the display device of the host computer 80 when recording is performed in a specific zone method. Furthermore, after receiving the number of zones and setting the number of zones by equally dividing in the radial direction, the display device of the host computer 80 displays the capacity of each zone and displays it from the user. It can be configured to accept the setting of the zone capacity desired by the user in the form of accepting the change of the zone capacity. With such a configuration, the user can easily set the capacity of each zone. Further, the drive controller 1428 accepts information to be written in the optical disc medium 10 such as partition division information and directory information in response to a request from the host computer 80.

Next, in step 1502, the disk ID 40 is read from the optical disk medium 10 by the same operation as during reproduction.
Read.

In step 1504, the drive controller 1428 creates information to be written in the sector management information section and further determines where on the optical disk medium 10 the sector management information should be written. Specifically, when the CAV method is specified by the user in step 1501, the same information as the sector management information is created as the sector management information by the conventional CAV method including the sector number, track number, sector identification mark, and the like. To do. Then, a physical sector is set with a fixed capacity so that it has the same capacity as the logical sector received from the user in step 1501.
The writing position of the sector management information is determined so that the sector management information is arranged at the head of the physical sector. on the other hand,
When the zone method is specified by the user in step 1501, in addition to the sector management information having the same contents as the CAV method, information indicating that the recording method is the zone method, the number of divided zones, and Information indicating the capacity of each zone and partition information requested to be written by the host computer 80 are created as sector management information. In addition, the physical sector is set with a certain capacity so that it has the same capacity as the logical sector received from the user in step 1501, and the sector management information is set so that the sector management information is arranged at the head of the physical sector. Determine the writing position. Further, in the case of the zone system, the drive controller 1428 creates a table showing the relationship between the set zone number and the track number and a table showing the relationship between the zone number and the frequency division ratio of the data system PLL 1420, and drives the drive. Stored in the memory in the controller.

In step 1505, step 1504
The sector management information created in step 3 is displayed on the display device of the host computer 80. Then, if confirmation is obtained from the user (step 1506), the sector setter 14
The sector management information and its writing position are output to 17. The sector setter 1417 generates a signal representing the received sector management information. Data area setter 1410
Determines the writing position of the sector management information received from the drive controller 1428 via the sector setter 1417 by counting the servo clock signal, and when the optical head reaches that position, the laser driver 1407 performs sector management. By passing the information, the sector management information is written in the head portion of the physical sector (step 1507). Thereby, the optical disc medium 1
The initialization of 0 is completed.

When data is written in the data area 157, the servo system PLL 141 is used as in the reproduction.
9 generates a servo clock signal, and the address detection unit 1412 detects the track number using this servo clock signal. Then, from this track number, the drive controller 1428 determines the frequency division ratio for each zone using the table created at the time of initialization, and the data system PLL
1420 generates a data clock signal. Modulator 14
Reference numeral 16 forms a signal representing information to be recorded in the data area 157 in synchronization with the data clock signal, passes it to the laser driver 1407, and causes the optical head 1403 to record it on the optical disc medium 10. As a result, the frequency of the data clock signal changes for each zone, and data is recorded in the data area 157.

As described above, in the optical disk device according to the second embodiment shown in FIG. 12, it is possible to match the physical sector and the logical sector by additionally writing the sector management information. There is no need to convert to and. Furthermore, when recording / reproducing by the zone system peculiar to this embodiment, it is possible to arrange a zone having a capacity of a size desired by the user. Therefore, the user can match the zone with the desired capacity partition, and it is possible to treat one zone as one medium without having to associate the partition with the zone.

In the second embodiment described above, the table created by the drive controller 1428 is stored in the memory in the drive controller 1428, but this table is stored in a predetermined part of the optical disc medium 10. It can also be configured to. When the table is stored in the optical disc medium 10 in this way, the optical disc medium 10 recorded by the zone method peculiar to the present embodiment is recorded.
Can be recorded and reproduced in a compatible manner among a plurality of optical disk devices having the configuration of FIG. Further, as described above, the optical disc device of FIG. 12 can record and reproduce sector management information and data by the conventional CAV system, so that the conventional optical disc device for recording and reproducing by the CAV system and the book of FIG. CAV with the optical disk device of the embodiment
The optical disc medium 10 recorded by the method can be recorded and reproduced in a compatible manner.

In the above-mentioned second embodiment, the partition and the zone are in a 1: 1 correspondence, but it is also possible to make a one-to-many correspondence or a many-to-one correspondence. This will be described with reference to FIG.

FIG. 6 shows the relationship between the partition and the zone. The partition shows a logical file, while the zone shows a physical recording area on the optical disk medium. The size of both is 3 as shown in the figure.
There are two possible relationships. In either case, it can be realized by the optical disk device of this embodiment shown in FIG. Figure 6 (a)
Shows the case where the partition is smaller than the zone, FIG. 6 (b) shows the case where the size of the partition and the size of the zone match, and FIG. 6 (c) shows the case where the size of the partition is Zo
The size is larger than the size of In the case of the zone method peculiar to this embodiment, it can be said that FIGS. 6A and 6B are particularly suitable methods. This is because the user of the disc and the DOS (Disk Operating Sy)
The system considers a partition as one device, so some latency is not a problem when moving from one partition to another. In the case of FIG. 6 (a) and FIG. 6 (b), since the zones are not switched in the same partition, the frequency of the data clock signal is zoned in the same partition. There is no waiting time until stabilization. On the other hand, in the case of the system of FIG. 6C, information is recorded across zones even within the same partition, so the frequency of the data clock signal shifts from zone to zone within the same partition. There is a waiting time until stabilization. On the other hand, on the other hand, in the method of FIGS. 6A and 6B, there is a limitation that the size of the partition cannot be made larger than the zone, but FIG.
There is no limitation in the case of the method. Therefore, it can be said that the method of FIG. 6C is suitable when it is desired to increase the size of one partition even if the access time is somewhat sacrificed.

FIG. 9 shows an embodiment of a system in which the optical disk device of each of the above embodiments is connected to a personal computer (referred to as a personal computer).

The data processing unit of the personal computer comprises a processor unit 1820 and a semiconductor main memory 1840, and a keyboard 185 is provided via a system bus 1860.
0, the display 1810 is connected. The system of FIG. 9 is further characterized in that the optical disk device 70 is connected via the interface 1830. When the optical disk device of the present embodiment as shown in FIGS. 3 and 11 is used as the optical disk device 70, the optical disk medium 10 having a diameter of 64 mm has a capacity of 100 to 1 as shown in FIG.
A large amount of data of 80 MB can be recorded. As a result, it is possible to perform large-scale data processing equivalent to a workstation even though it is a personal computer. Also,
Since the optical disc medium 10 of FIGS. 3 and 11 is wearable, only the processed data can be stored in the optical disc medium and easily carried, and the optical disc medium 10 is compatible with other devices.

FIG. 10 shows an embodiment of a system in which the optical disk device of the present embodiment shown in FIGS. 3 and 11 is built in a note type computer. The note type computer 81 includes a liquid crystal display 82 and a keyboard 8.
3 and incorporates an optical disk device 70. By using the optical disc device of the present embodiment shown in FIGS. 3 and 11 as the optical disc device 70, as shown in FIG. 4, a large amount of information recorded on the optical disc medium 10 can be recorded.
It can be played or edited on a computer. Therefore, it is possible to easily store and edit a large amount of data such as voices and images.

In each of the above-mentioned embodiments, an optical disk medium having a diameter of 64 mm is taken as an example, but the disk size, the number of sectors, the number of segments, the modulation method, etc. can be changed appropriately. Further, by using a magneto-optical recording material such as TeFeCo as the recording material of the optical disc medium 10, a magneto-optical type optical disc medium can be basically constructed with the same film configuration as the above-mentioned optical disc medium 10.

The above-mentioned optical disk device shown in FIGS. 3 and 12 is the optical disk medium 1 recorded by the conventional CAV method.
When 0 is reproduced, and when the optical disk medium 10 has CA
When recording by the V method, the drive controller 142
8 is a data system PLL1420, a servo system PLL14
The configuration is such that the same frequency division ratio as 19 is set. This allows the data detector 1415 and the modulator 14
The frequency of the data clock signal set to 16 matches the frequency of the servo clock signal. However, not limited to this, as shown in FIG.
A switch 14 between the data detector 415 and the data system PLL 1420 and the data detector 1415 and the modulator 1416.
It is also possible to dispose 30 and switch the switch 1430 according to an instruction from the drive controller 1428. The drive controller 1428 is
When the optical disc medium 10 is reproduced, if the sector management information section does not record information indicating that it is recorded in the zone format, it is determined that the conventional CAV method is used for recording, and the switch 1430 is used. Servo system PLL141
Switch to 9 side, and set servo clock to data detector 141
5 and modulator 1416. Also, when recording is performed on the optical disc medium 10 by the CAV method, the switch 1430 is switched to the servo system PLL 1419 side.
As a result, when recording / reproducing is performed by the conventional CAV method, the data system PLL 1420 is not used, and thus it is not necessary to set the frequency division ratio in the data system PLL 1420. In addition, when recording with the zone method peculiar to this embodiment,
The switch 1430 is switched to the data system PLL 1420 side, and the frequency division ratio corresponding to each zone is set in the data system PLL 1420.

In addition, the optical disk device of this embodiment is a CA
It has already been described that recording and reproduction can be performed by the V method and the zone method peculiar to this embodiment. By expanding this, it is possible to divide one optical disk medium 10 into a plurality of areas, change the recording / reproducing method for each area, and perform recording by the CAV method or the zone method peculiar to this embodiment.
On the other hand, in the optical disk device of the present embodiment, the servo system is the sample servo system in which the tracking error is detected by the pit row formed by the concavo-convex, so the ROM type data formed by the pit row can be easily reproduced. .
Further, by using a phase change type or magneto-optical type recording material as in the above-mentioned embodiment, a recordable and reproducible RAM type structure formed by marks having different reflection characteristics can be obtained. Therefore, for example, as shown in FIG. 14, one optical disc medium 10 is concentrically divided into four regions 11, 12, and 1.
3 and 14, the area 11 is a ROM area formed by pit rows by the zone method peculiar to this embodiment, the area 12 is a ROM area formed by pit rows by the CAV method, and the area 13 is by a zone method peculiar to this embodiment. Like a RAM area formed by marks and a RAM area formed by marks in the CAV method, two different recording / reproducing methods and two different medium materials (ROM area and RAM) are formed on one optical disk medium 10. Area) can be mixed. The sector management information section 21 and the servo mark area are areas 11, 12,
They are arranged radially through 13 and 14.

However, since the optical head of the optical disk device shown in FIGS. 3 and 12 described above cannot form a pit row on the optical disk medium 10, the pits in the ROM area are formed with separate concave and convex pits. It is formed in advance by the device.

By doing so, the ROM area formed by the pit row which can obtain a relatively large S / N ratio is recorded by the zone system having a large recording density, which is peculiar to this embodiment, and the relatively small S / N ratio is obtained. RA formed with a ratio mark
If the M area is recorded by the CAV method having a low recording density, the optical disk medium 10 having a large storage capacity as a whole medium and high reliability and good balance can be constructed.

By recording a part of the information in the ROM area recorded by the zone method peculiar to this embodiment by the CAV method, the information of the optical disk medium 10 of FIG. It becomes possible to record and reproduce a part of the data, and there is an advantage in terms of compatibility of the optical disc medium 10.

Further, the ROM / R as shown in FIG.
In addition to the AM mixed medium and the zone / CAV mixed medium peculiar to this embodiment, a medium having a full ROM area and a full R
A medium in the AM area can be easily constructed. The characteristic through these media is that the servo system is a sample servo,
Similar to the CAV system, the servo marks are radially arranged, and at least a part of the data is recorded at a higher linear recording density in the outer peripheral zone of the medium by the zone system peculiar to this embodiment. That is, it is an optical disk medium.

[0090]

As described above, according to the optical disk device of the present invention, since the optical disk medium can be reproduced by the sample servo system, high speed access is possible, and the recording density is higher than that of the conventional CAV system. It is possible to reproduce the optical disc medium on which the data is recorded.

[Brief description of drawings]

FIG. 1A is an explanatory diagram showing a sector configuration of an optical disc medium used in an optical disc device according to a first embodiment of the present invention.
(B) Explanatory drawing which shows the structure of 1 segment of the optical disk medium of (a).

FIG. 2 is an explanatory diagram showing a configuration of one sector of the optical disc medium of FIG.

FIG. 3 is a block diagram showing a configuration of an optical disc device according to a first embodiment of the present invention.

4 is a graph showing a change in storage capacity when the number of zone divisions is changed in the optical disc device of FIG.

FIG. 5 is a flowchart showing a procedure for initializing an optical disc medium in the optical disc device according to the second embodiment of the present invention.

6 (a), (b), (c) in the optical disk device of the second embodiment of the present invention, when a partition is arranged,
Explanatory drawing showing the relationship between a partition and a zone.

FIG. 7 is a block diagram showing a configuration when the optical disk device of one embodiment of the present invention is connected to a host computer.

8 is a cross-sectional view showing the layer structure of the optical disc medium of FIG.

FIG. 9 is a block diagram showing a configuration when the optical disk device of one embodiment of the present invention is connected to a personal computer.

FIG. 10 is a perspective view showing an appearance of an optical disc device according to an embodiment of the present invention when the optical disc device is built into a notebook computer.

11 is a flowchart showing a procedure for initializing an optical disc medium in the optical disc device of FIG.

FIG. 12 is a block diagram showing a configuration of an optical disc device according to a second embodiment of the present invention.

FIG. 13 is a block diagram showing the configuration of an optical disc device according to still another embodiment of the present invention.

FIG. 14 is an explanatory diagram showing an embodiment when an optical disk medium is formatted by the optical disk device of the present invention.

[Explanation of symbols]

10 ... Optical disc medium, 20 ... Track, 21 ... Sector management information section, 30 ... Sector, 40 ... Disc ID, 10
0 ... Servo mark area, 101 ... Wobble pit, 10
2 ... Clock pit, 120 ... Segment, 157 ... Data area, 1402 ... Spindle motor, 1403 ... Optical head, 1404 ... Coarse actuator, 1405 ...
Rotation speed control unit, 1410 ... Data area setting unit, 1417
... Sector setting device, 1419 ... Servo system PLL, 1420
... data system PLL, 1422 ... sector management information adder,
1425 ... Dividing ratio setting unit, 1428 ... Drive controller, 1430 ... Switch.

Claims (17)

[Claims] 1. An optical disc apparatus for reproducing an optical disc medium in which servo marks are preliminarily formed in a radial pattern from the center in a sample servo system mode, a rotating means for rotating the optical disc medium at a constant angular velocity, and A reproducing optical head for detecting a recorded mark and converting it into a signal, and a signal of the repetition frequency of the servo mark appearing in the signal detected by the reproducing optical head is taken out, and the frequency is set to a predetermined constant value. A servo clock generating means for generating a clock signal for controlling the tracking of the reproduction optical head by dividing by a ratio; and a signal of the repetition frequency of the servo mark appearing in the signal detected by the reproduction optical head, To reproduce the data on the optical disc by dividing the frequency by a specified ratio A data clock generating means for generating a clock signal; and a data clock generating means for detecting at which position of the optical disc medium the mark for the reproducing optical head is detected, and according to the position of the reproducing optical head. 2. An optical disc device, further comprising: a control unit for instructing the ratio. 2. The control means according to claim 1, wherein when the reproducing optical head is located at a position far from the center of the optical disk medium in the radial direction, the ratio is relatively closer to the center side as the value of the ratio. An optical disk device characterized by instructing the data clock generation means to a value equal to or greater than the value of the ratio when it is located. 3. The control means according to claim 2, wherein a plurality of zones arranged concentrically on the optical disk medium are set, and when the reproducing optical head is located in the same zone, An optical disk device, wherein the same value is designated as the ratio. 4. The control means according to claim 5, further comprising information indicating a relationship in which the zone and a ratio instructing the data clock generating means are associated with each other, and based on the information indicating the relationship, An optical disk device, characterized in that a ratio instructed to the data clock generating means is obtained and instructed. 5. The optical disc medium according to claim 1, wherein a plurality of tracks and a mark indicating the track number are formed in advance, and a signal of the mark indicating the track number converted by the optical head. Further includes a track number reproducing means for reproducing in synchronization with the clock signal generated by the servo clock generating means, wherein the control means reproduces the track number reproduced by the track number reproducing means from the optical head. An optical disk device characterized by being used as a position. 6. A recording optical head for forming marks on the optical disc medium, and a signal representing data to be recorded on the optical disc medium in synchronization with a clock signal generated by the data clock generating means. The recording optical head further comprises: a data recording unit that delivers the recording optical head; and an identification mark forming unit that instructs the recording optical head to record a predetermined identification mark. The position where the recording optical head forms a mark on the optical disk medium is detected, and the ratio is instructed to the data clock generating means according to the position of the recording optical head, and the data clock is generated. When the ratio instructed to the means is different from the predetermined ratio in the servo clock generation means, the identification marker indicating that the ratio is different is indicated. Optical disc apparatus characterized by instructing the recording of the identification mark to click forming means. 7. The reproducing device according to claim 6, wherein the reproducing means detects the mark at which position on the optical disk medium the reproducing optical head detects when the reproducing optical head detects the identification mark. Is detected, the ratio is instructed to the data clock generating means according to the position of the reproducing optical head, and when the reproducing optical head does not detect the identification mark, the data clock generating means The optical disk device is characterized in that the servo clock generating means is instructed to the same value as a predetermined ratio. 8. The optical disk medium according to claim 6, wherein the optical disk medium is divided into a plurality of sectors in advance, and a sector management information section in which information for managing the sectors is recorded is formed in advance in the sector. An optical disk device, wherein the means adds the identification mark to the sector management information section. 9. The optical disk device according to claim 3, wherein the control means sets a predetermined number of zones as the zones. 10. The optical disk device according to claim 3, wherein the control means receives the number of the zones from a user and sets the received number of zones. 11. The optical disk device according to claim 3, wherein the control means sets the zone so that the optical disk medium is equally divided in a radial direction. 12. The control means according to claim 3, wherein the control means receives a storage capacity of each zone from a user and sets the zone so that the storage capacity of each zone becomes the received storage capacity. Optical disk device. 13. The control means according to claim 12,
Information representing a relationship in which the zone and a ratio instructing the data clock generating means are associated is formed, a ratio instructing to the data clock generating means is obtained based on the information representing the relationship, and this is instructed. An optical disk device characterized in that. 14. The optical disk medium according to claim 13, further comprising a recording optical head for forming a mark on the optical disk medium, wherein the control means provides the recording optical head with a mark representing information indicating the relationship. An optical disk device for recording on a medium. 15. A sector capacity specification is received from a user, information for managing the sector is generated, and a signal representing the sector management information is used as a clock signal generated by the servo clock generation means. The identification mark forming means further comprises a sector management information forming device which forms a sector management information part on the optical disc medium by delivering the recording head in synchronization with the timing of the capacity of the sector designated by the user. An optical disc device, wherein an identification mark is additionally written in the sector management information section. 16. A rotating means for rotating an optical disk medium, on which servo marks are preliminarily formed radially from the center in a sample servo system, at a constant speed, and a mark recorded on the optical disk medium is detected to generate a signal. A reproducing optical head for converting, a servo clock generating means for generating a clock signal by dividing the signal of the servo mark detected by the reproducing optical head at a predetermined constant ratio, and the reproducing optical head Data clock generating means for generating a clock signal by dividing the detected servo mark signal by an instructed ratio, and using the clock signal of the servo clock generating means,
Tracking control means for controlling tracking of the reproduction optical head, and data reproduction for reproducing a signal converted by the reproduction head and representing data recorded in the optical disk device in synchronization with an input clock signal. Means for detecting a specific identification mark recorded on the optical disc medium, and using this identification mark, one of the clock signals generated by the servo clock generation means and the data clock generation means is used to reproduce the data. Means for selecting and inputting the reproducing clock, and when the switching means selects the data clock generating means, it detects which mark on the optical disk medium the reproducing optical head detects. Then, the ratio is set to the data clock generating means according to the position of the reproducing optical head. Optical disc apparatus characterized by having a Shimesuru control means. 17. A recording optical head for forming a mark on the optical disk medium, a data recording means for transferring data to be recorded on the optical disk medium in synchronization with an input clock signal, and Recording clock switching means for receiving a user's instruction and selecting and inputting one of the clock signals generated by the servo clock generating means and the data clock generating means to the data recording means; and the recording clock switching means. When the data clock generating means is selected, the recording optical head has identification mark forming means for instructing the recording optical head to record the identification mark, and the control means comprises the recording clock switching means. However, when the data clock generating means is selected, the recording optical head is the same as the optical disk medium. The optical disk device is characterized in that it detects whether a mark is formed at the position, and indicates the ratio to the data clock generation means according to the position of the recording optical head.