JPH0554386A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To process every area with the single clock by processing data with a clock of an integral multiple of almost the lowest common multiple (L.C.M.) of the recording clock rate of each area when an area for reproduction and a recordable area coexist. CONSTITUTION:An optical disk 1 is divided into zones A and B, each zone has the servo byte of the area for reproduction and the data area for recordable area. A reproduction signal to be supplied to a reading circuit is supplied to a clock bit extraction circuit 22, extracting servo byte data. A PLL 23 outputs the frequency of the lowest common multiple of the recording clock rate of each area of each zone based on this data. In short, the servo byte and the recording clock in the data area are respectively 15MHz, 10MHz in a zone A and the servo byte and the recording clock of the data area are 15MHz in a zone B. Thus, the lowest common multiple 30MHz is generated to be used as a clock for recording and reproduction of each zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device and a reproducing device suitable for application to, for example, a magneto-optical disk.

[0002]

2. Description of the Related Art In a disk-shaped recording medium, as a control of the rotation speed when recording / reproducing data, a constant rotation speed (CA) for recording / reproducing at a constant rotation speed
V) control and constant linear velocity (CLV) control for recording / reproducing at a constant linear velocity. Comparing these two types of control, in the case of the constant rotation speed control, the rotation speed is constant, so that the speed control is relatively simple, and the control data such as the track address can be recorded at constant intervals. Search can be done easily. Further, in the case of the constant linear velocity control, the rotation speed needs to be changed according to the position of the optical pickup, which complicates the speed control system, but since the recording density can be made constant, the rotation speed is constant. Although the amount of recorded information can be made larger than that of control, it is difficult to record control data such as a track address at equal intervals, so that there is an inconvenience that the track search is troublesome.

Generally, in the case of a magneto-optical disk having a large data recording capacity, data can be recorded / reproduced by a constant rotation speed control which facilitates track search so that necessary data can be easily searched. Many are set to be performed. However, as described above, the constant rotation speed control has a disadvantage that the recording capacity is lower than that of the constant linear speed control, and a zoning recording method has been proposed as a method for increasing the recording capacity by recording by the constant rotation speed control.

FIG. 1 shows an example of a recording medium (magneto-optical disk) on which this zoning recording is performed. The data recording area of the disk is divided into a zone A near the center of the disk and a zone B near the periphery. The tracks in each zone are subjected to constant rotation speed control for recording / reproducing at the same rotation speed, and the recording clock rate or the rotation speed is changed between zone A and zone B. By doing so, the recording capacity can be increased.

14 and 15 are views showing that the recording capacity is increased by this zoning recording. FIG. 14 shows an example in which zoning recording is performed by dividing into 3 zones, and FIG. In the case of constant control), an example in which data is recorded in pits on each disk is shown. Here, when zoning recording is performed as shown in FIG. 14, the innermost track T1 of each zone 1, 2, 3 is recorded.
The recording linear densities of 1, T21 and T31 are set to be the same. In each zone 1, 2, 3, constant rotation speed control is performed (the clock rate or the rotation speed of the recording data changes when the zone changes), so the recording linear density decreases as the track becomes closer to the outer peripheral side. .. By dividing into a plurality of zones in this way, the linear recording density of one track can be returned to the highest state each time the zone changes, and the linear recording density becomes the highest as in the case where the zones are not divided as shown in FIG. The recording capacity can be greatly increased as compared with the case where the outer track is gradually lowered. That is, the outermost track without zone division has a very low linear recording density, but when the zone is divided into a plurality of zones, a certain degree of linear recording density is secured even with the outermost track. In this case, the recording capacity can be further increased by increasing the number of zones.

By the way, in the case of a magneto-optical disk capable of recording / reproducing various data, not limited to a recording medium for performing such zoning recording, data for tracking control or the like is previously recorded in each track. May be provided with the location. That is, in order to enable the optical pickup to accurately trace on the track formed on the magneto-optical disk, data is recorded on this track by pits at predetermined intervals, and the data is recorded by this pit at the time of recording or reproduction. Tracking control such as sample servo is performed at the recorded location so that the target track can be traced accurately. in this case,
Address data such as track numbers are also recorded by pits.

Generally, in a portion where data is recorded in advance by such pits, higher density data recording can be performed as compared with the case where data is recorded by the magneto-optical effect. Therefore, from the viewpoint of effectively utilizing the recording area of the disc, the clock rate of the prerecorded data is set higher than the clock rate of the data recorded in the area where the data is recorded / reproduced by the magneto-optical effect. It is preferable to reduce the area where the data is recorded by the pits and increase the area where the data can be recorded / reproduced by the magneto-optical effect.

[0008]

However, when the data recorded at a plurality of clock rates are mixed on one recording medium, there is a disadvantage that the load on the recording device or the reproducing device increases. That is, since it is necessary to switch the clock rate depending on the recording / reproducing area, the configuration of the recording system circuit and the reproducing system circuit becomes complicated accordingly. In particular, in the case of the above-mentioned zoning recording, the clock rate is different in each zone, so when combined with the clock rate of the part recorded in the pit, data can be recorded on a single disc at a large number of types of clock rates. It will be recorded and requires very complex control.

In view of the above, the present invention makes it easy to record / reproduce data using a recording medium in which an area in which data is previously recorded by pits and the like, and an area in which data can be freely recorded / reproduced are mixed. It is an object of the present invention to provide a recording device and a reproducing device that can be used.

[0010]

According to the present invention, a recording medium in which a data reproduction exclusive area and a data recordable area are mixed is used, at a clock rate different from the clock rate of the data recorded in the data reproduction exclusive area. In a recording device that records data in a data recordable area, the clock rate of the record data in the data reproduction-only area and the clock rate of the record data in the data recordable area,
Recording is performed at a clock rate that is an integer multiple of the least common multiple.

Further, the present invention is a reproducing apparatus in which a data reproduction exclusive area and a data recordable area are mixed, and data recorded at different clock rates are reproduced in the data reproduction exclusive area and the data recordable area. The reproduction is performed at a clock rate that is an integral multiple of the least common multiple of the clock rate of the recording data in the data reproduction exclusive area and the clock rate of the recording data in the data recordable area.

[0012]

According to the present invention, data is recorded with a clock that is an integer multiple of the least common multiple of the clock rate of the data reproduction-only area and the clock rate of the data recordable area. The recording process can be performed with this clock, and the configuration of the recording device is simplified.

Further, according to the present invention, a clock which is an integral multiple of the least common multiple of the clock rate of the data reproduction exclusive area and the clock rate of the data recordable area
Since the data is reproduced, the reproduction processing can be performed with a single clock in any area, and the structure of the reproducing device is simplified.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The present embodiment is applied to a magneto-optical disk capable of freely recording and reproducing data, and the magneto-optical disk is subjected to zoning recording as shown in FIG. That is, a plurality of tracks are formed concentrically on one magneto-optical disk, and the tracks are divided into a zone A composed of tracks closer to the center and a zone B composed of tracks closer to the outer periphery. In this case, for example, if the size of the magneto-optical disc is 32 mm in radius, the range of zone A is 16 mm to 22 mm, and the range of zone B is 22 mm to 30 mm. Then, data recording / reproduction is performed at a constant rotation speed in each zone, and in this example, zoning recording is performed in which the recording density is changed by changing the clock rate of the recording data for each zone.

As shown in FIG. 2, each of the annular tracks in each of the zones A and B is composed of 990 segments. In this case, each 1-unit segment is composed of a servo byte of 4 bytes and a data area of 20 bytes (for zone A) or 30 bytes (for zone B). The 4-byte servo byte at the beginning of each segment is a so-called pre-pit in which data is previously recorded in pits on the disc, and sample servo control is performed by the data of this pre-pit at the time of recording / reproducing. Further, the track address and the sector address are recorded by the data of this pre-pit and are used at the time of search. Data is recorded in the 20-byte or 30-byte data area following the servo byte by a magneto-optical effect by a circuit having a configuration described later. This 20
The difference of 1.5 times the recording capacity between 30 bytes and 30 bytes,
This is due to the difference in recording clock rate between zone A and zone B. That is, by zoning recording, the linear recording density of the innermost track of zone A and the linear recording density of the innermost track of zone B are set to be substantially the same.
With such a setting, the recording capacity of the data area changes for each zone.

In this example, the clock rate of the recording data is changed between the 4-byte servo byte and the 20-byte data area of zone A. That is, in the case of a servo byte, which is a read-only area in which data is recorded in advance by pits, it is possible to record data at a higher density than the recordable area where data is recorded and reproduced by the magneto-optical effect. In the case of the example, the recording clock rate of the servo bytes in zone A is 1.5 times the recording clock rate of the data area in zone A. Specifically, for example, the recording clock rate of the servo bytes in zone A is 15 MHz, and the recording clock rate of the data area in zone A is 10 MHz. In the case of zone B, the recording capacity of the data area is 1.5 times that of zone A as described above, so the recording clock rate of the servo bytes and the recording clock rate of the data area match. That is, for example, the recording clock rate of the servo bytes and the data area of zone B is set to 15 MHz.

In the case of zone A, as shown in FIG. 3, 33 segments form one sector, and one track forms 30 sectors. Further, in the case of zone B, as shown in FIG. 4, 22 sectors form one sector, and one track forms 45 sectors. In this case, the positions of the sectors are aligned within each zone. Therefore, as shown by the broken line in FIG. 1, the boundary of each sector exists radially in each zone.

When data is recorded, this sector is used as a unit. As for the structure of each sector, in the case of zone A, as shown in FIG. 5, the data area of the first segment (first segment) of the 33 segments forming one sector is set as the reference area. 20-byte reference data (reference data) is recorded when data is recorded in the sector. This reference data is for detecting the quality of the recording signal at the time of reproduction,
Specifically, a signal of a constant frequency is recorded, the reproduction level of the reference data is detected during reproduction, the gain is adjusted, and the system clock and the reproduction data are synchronized with each other. It is recorded in all sections of the area. In the data areas from the second segment to the 33rd segment, 20 bytes of data are recorded in each segment.

Therefore, in the case of zone A, one sector has 20 bytes of reference data and 640 bytes (20 bytes x
Various data of 32 segments) are recorded.

In the case of zone B, as shown in FIG. 6, the data area of the first segment (first segment) of the 22 segments forming one sector is used as the reference area, When data is recorded, 30-byte reference data is recorded. The reference data for this zone B is the same as the reference data for zone A described above,
It is recorded in the entire data area of the first segment. In the data area from the second segment to the 22nd segment, 30 bytes of data are recorded in each segment.

Therefore, in the case of zone B, 30 bytes of reference data and 630 bytes (30 bytes x 1 sector)
21 segments) and various data are recorded.

Thus, in zone A and zone B, 1
The storage capacities of the sectors are almost the same, and the zone B has a larger storage capacity of one track because the number of sectors of each track is larger in the zone B.

Next, a recording / reproducing apparatus for a magneto-optical disk in which each track is formed in this way will be described.

FIG. 7 is a diagram showing the structure of a recording / reproducing apparatus for a magneto-optical disk to which the present invention is applied. Reference numeral 1 denotes a magneto-optical disk, and this magneto-optical disk 1 has a zone A as shown in FIG. Zoning recording is performed by dividing the recording into two zones, i.e., zone B and zone B. The magneto-optical disk 1 is rotationally driven by a spindle motor 2, and a signal is recorded / reproduced by an optical pickup 3 having a semiconductor laser or the like built therein. The rotation control of the spindle motor 2 and various controls (seek control, etc.) of the optical pickup 3 are performed by a system controller 4 having a microcomputer configuration.

The data recorded on the magneto-optical disk 1 is RA from a recording data forming circuit (not shown).
It is supplied to the M control circuit 11 and temporarily stored in the RAM 12 under the control of the RAM control circuit 11. Then, the stored data is supplied from the RAM 12 to the modulation circuit 13 at a predetermined timing, the modulation circuit 13 performs recording modulation, and the modulated recording data is supplied to the writing circuit 14, and the writing circuit 14 A predetermined writing process is performed at 14, and the processed recording data is supplied to the optical pickup 3 to perform writing by the magneto-optical effect.

The data thus written on the magneto-optical disk 1 is read by the optical pickup 3 and supplied to the read circuit 15, and the data subjected to the predetermined read processing by the read circuit 15 is demodulated. It is supplied to the circuit 16. Then, the data demodulated for reproduction by the demodulation circuit 16 is temporarily stored in the RAM 12, and the RAM control circuit 1
Under the control of 1, the data stored in the RAM 12 is read and supplied to the reproduction data output circuit (not shown) side.

Here, the detailed structure of the read circuit 15 and its surroundings required for reproduction is shown in FIG. 8 and FIG. 9. In this example, each zone of the magneto-optical disk 1 is a servo byte in which each zone is a reproduction-only area. Since at least two types of clocks corresponding to the respective areas are originally required as the read clocks because the data area and the data area that is a recordable area are mixed, one type of clock is commonly used. .. That is, when the configuration of the clock generation circuit is shown in FIG.
The reproduction signal supplied to the read circuit 15 obtained at the terminal 21 is supplied to the clock pit extraction circuit 22, and the data of the servo byte is extracted by the clock pit extraction circuit 22. Then, the extracted servo byte data is set to P
The signal is supplied to the LL circuit (phase locked loop circuit) 23. The PLL circuit 23 is a circuit for converting the frequency signal synchronized with the input data into a frequency signal output from the PLL circuit 23, and supplies the frequency signal obtained at the terminal 24 to the servo byte of each zone. In addition to the data detection clock, it is used as a data detection clock (during reproduction) or a data writing clock (during recording) in the data area of each zone.

Here, in this example, the frequency signal output from the PLL circuit 23 is set to the least common multiple of the recording clock rate of each area of each zone. That is, in zone A, the recording clock rate of the servo bytes is 15 MHz, the recording clock rate of the data area is 10 MHz, and in zone B, the recording clock rate of the servo bytes and the data area is 15 MHz. Therefore, 30 MHz becomes the least common multiple, and when the servo control of the disk is proper, the PLL circuit 23 becomes 30 M
It is designed to output a frequency signal of Hz.
The frequency signal of MHz is used as the recording / reproducing clock for each zone.

The structure of the read circuit 15 for extracting the reproduced data based on the clock thus created is shown in FIG.
The reproduction signal supplied to the AGC circuit (automatic gain adjustment circuit) 32, the amplitude detection circuit 33, and the clock phase detection circuit 3
4 and supply. Then, the amplitude detection circuit 33 detects the reproduction amplitude of the reference data, and the clock phase detection circuit 34 detects the reproduction phase of the reference data. Then, the detection data of both detection circuits 33 and 34 are supplied to a central control unit (CPU) 35 for read control. Then, the central controller 35 controls the gain adjustment amount of the reproduction signal performed by the AGC circuit 32 based on the supplied amplitude detection data. Further, the correction data of the read clock is created based on the supplied clock phase detection data, and this correction data is supplied to the clock phase correction circuit 39.
The clock phase correction circuit 39 performs phase adjustment (phase shift) of the data detection clock obtained at the terminal 24 based on the correction data, and supplies the adjusted clock to the data detection circuit 38. Then, the data is detected from the reproduction signal in synchronization with the clock supplied by the data detection circuit 38.

In this case, in this example, the PLL circuit 23
Since a frequency signal of 30 MHz (when the servo control is appropriate) is used as a clock supplied from the clock phase correction circuit 39 to the clock phase correction circuit 39, data can be detected with this clock regardless of the recording signal of either zone A or zone B. You can That is, as described above, by setting the clock to the least common multiple of the clock required in each zone, in the case of the servo byte of the zone A, data detection is performed every two cycles of the clock obtained at the terminal 24. Then, the same data detection as that of detecting the data of the servo byte with the clock of 15 MHz can be performed. Further, in the case of the data area of the zone A, the data of the servo byte is 10 by detecting the data every three cycles of the clock obtained at the terminal 24.
Data detection similar to that detected with the MHz clock can be performed. Further, in the case of zone B, the data of the servo byte is detected by the clock of 15 MHz by detecting the data every two cycles of the clock obtained at the terminal 24 in any area. Similar data detection can be performed.

The data detection state will be described with reference to FIG. 10. A in FIG. 10 is a servo byte and a recordable area (so-called RAM area) which are read-only areas (so-called ROM areas) of zone A. A predetermined track near the boundary with a certain data area is shown. Binary data is recorded in the read-only area with or without pits.
Binary data with polarities (N pole or S pole) is recorded in the data area. The recording data in this case is data by NRZI modulation, that is, data that is inverted when it is "1". Further, there is a non-recorded portion of a predetermined length between the servo byte and the data area.

When reproducing the track shown in FIG. 10A, the clock (clock after phase correction) output from the PLL circuit 23 based on the recording data of the servo byte is
As shown in B of FIG. 10, by detecting the recording data of the servo byte in synchronization with this clock (detecting at the timing shown by the arrow), as shown in C of FIG.
The data changes every two cycles of this clock. Therefore, by detecting the data every two clock cycles, the recording data of the servo byte can be correctly detected, and the address data and the like recorded in the servo byte can be detected. Alternatively, the recorded data can be detected correctly in the same manner by performing the data detection at every timing synchronized with the clock and then making the data equal every two cycles.

In the data area following the servo bytes of zone A, the recording data changes every three clock cycles shown in B of FIG. 10, and C of FIG.
As shown in FIG. 3, by performing data detection every three clock cycles, the recorded data in the data area can be correctly detected. Alternatively, recording data can be detected correctly in the same manner by performing data detection every time in synchronization with the clock and then performing equalization every three cycles.

Although not shown, when reproducing each track of zone B, since the clock rate of the recording data is the same in the servo bytes and the data area, the clock output by the PLL circuit 23 in any area. Data changes every 2 cycles of
Recording data can be correctly detected by performing data detection in each cycle.

The structure for detecting the reproduction data by the clock thus formed will be described again with reference to FIG. 9. The data detection circuit 38 is supplied with the reproduction signal whose gain is adjusted by the AGC circuit 32. , Based on the above clock supplied from the clock phase correction circuit 39,
The data recorded on the disc is decoded from the reproduction signal, and the decoded data is used as reproduction data in the terminal 40.
To the circuit in the subsequent stage via.

A terminal 36 is a terminal to which a reproduction signal of data recorded in pits, that is, a servo byte is supplied. The reproduction signal obtained at this terminal 36 is supplied to an address detection circuit 37, and this address detection circuit is supplied. The address data decoded at 37 is supplied to the central control unit 35, and the central control unit 35 determines the track or sector currently being reproduced from this address data.

When reproducing the data recorded on the magneto-optical disk 1 by the circuit configured as described above, FIG.
The process is performed at the timing shown in. That is, A in FIG.
As shown in B of FIG. 11, the amplitude detection circuit 3 is reproduced during reproduction of the reference data of the first segment of each sector.
3, the reproduction amplitude of the reference data is detected, and the reproduction phase of the reference data is detected by the clock phase detection circuit 34 as shown in C of FIG. Then, when the servo byte of the second segment is being reproduced, the central control unit 35 judges the reproduction amplitude and the reproduction phase, as shown in D of FIG. 11, and determines the gain adjustment amount and the gain adjustment amount in the AGC circuit 32. The amount of phase correction in the clock phase correction circuit 39 is controlled. And
In the state where the gain adjustment and the phase correction are performed in this way, as shown in E of FIG. 11, the data recorded in the data area from the second segment is decoded. In addition,
Sample servo control is performed for each segment based on the data reproduced from the servo bytes of each segment.

When the next sector is reproduced and the reference data is reproduced, the gain adjustment and the phase correction are readjusted (re-correction) based on the reference data in the same manner.
The reproduction state is adjusted (corrected) for each sector based on the reference data.

In this case, in this example, regardless of whether the reproduction track is zone A or zone B, the first sector of each sector is
Since the reference data is recorded in all the sections other than the servo bytes of the segment, data processing is performed in segment units as shown in FIG. 11, and reproduction processing can be performed with simple control.

That is, the recording capacity of the servo bytes is 4 bytes in both zone A and zone B, and the PLL circuit 23 is based on the reproduction data of 4 bytes in any zone.
By using the system clock formed in step 2, the timing control of the reproduction process (switching control between servo byte and data area, etc.) can be performed. Therefore, in this example, although the zoning recording is performed, the timing control such as switching between the servo byte and the data area can be commonly performed in each zone, but the recording state of the reference data is set in segment units. The detection timing is also the same in each zone, and the control shown in FIG. 11 is performed at the same timing in all zones, so that the reproduction process using the reference data can be easily performed. Further, in this example, since the clock frequency for reading data is common in each area, only one set of PLL circuits and the like for generating the reproduced clock need be provided, and the structure of the reproducing system circuit becomes simple. In particular, since a common clock can be used for the servo bytes and the data area of zone A, it is not necessary to switch the clock during reproduction of each track of zone A, and data with different clock rates can be mixed and recorded in one track. Even with the configuration of this example in which the density is increased, there is no burden on the reproduction system circuit.

Next, the recording process will be described.
Also during this recording, the data recorded in advance in the servo bytes of each zone is reproduced to create the system clock of the recording device, and writing is performed in synchronization with this clock. That is,
As described with reference to FIG. 8, the data of the servo byte is extracted by the clock pit extraction circuit 22, and the extracted data is supplied to the PLL circuit 23 to be a frequency signal of 30 MHz, which is used as a writing clock. Thus, good writing can be performed in both zone A and zone B. In this case, in zone A, the same data is repeatedly written three times, and in zone B, the same data is repeatedly written twice.

This writing state will be described with reference to FIG. 10 which is also referred to during reproduction. It is assumed that the clock shown in B of FIG. 10 is obtained as the output of the PLL circuit 23 by the reproduction signal from the servo byte of the zone A. At this time,
When recording predetermined data in the data area which is a recordable area, the same data (high level signal or low level signal) is repeatedly written by the magneto-optical effect every three cycles of the clock. In the case of zone B, although not shown, the same data is repeatedly written every two clock cycles.

By writing data in this way, 20 bytes of data can be written in one segment in the case of zone A, and 30 bytes of data can be written in one segment in the case of zone B. In both zones, the clock based on the reproduction signal of the servo byte can be used as it is as the write clock, and the configuration of the recording system circuit is as simple as the reproduction system circuit.

In the above embodiment, the read-only area in which data is recorded in advance is the servo byte for sample servo control, but the read-only area in which various data other than the servo byte is recorded is Record
The present invention can also be applied to a reproducing device for a recording medium in which reproduction areas are mixed. For example, the present invention can be applied to a reproducing apparatus for a recording medium in which an area where data can be recorded by the magneto-optical effect and a reproduction-only area where data is previously recorded by pits and cannot be erased are mixed in units of one sector.

Here, FIG. 12 shows an example of a recording medium in which such a reproduction-only area and a recordable area coexist. For example, the predetermined track Ta of this recording medium is divided into 6 segments, and each segment is segmented. Alternate play-only area (ROM area) and recordable area (RAM area)
It can also be applied to a configuration in which and are mixed. In this case, the control program or the like is recorded in advance by the pits in the segment of the reproduction-only area at a relatively high clock rate, and the processing result based on the control program is recorded in the segment of the recordable area by the polarity at a relatively low clock rate. It is possible to record it.
Then, by sharing the clock of the recording system circuit or the reproduction system circuit when recording or reproducing in both areas with the least common multiple, it is not necessary to switch the clock in one track, and the same operation as the above-mentioned embodiment can be realized. The effect is obtained.

Further, FIG. 13 shows that a reproduction-only area (ROM area) and a recordable area (RAM) are alternately arranged for each track.
Area), if all the segments of a predetermined track Tb of this recording medium are read-only areas, all the segments (excluding servo bytes) of the next track Tb + 1 are recordable areas. , All the segments of the next track Tb + 2 become the reproduction-only area again. Then, by changing the clock rate of the recording data between the track in the reproduction-only area and the track in the recordable area, efficient recording can be performed. However, the recording system circuit or the reproduction system circuit when recording or reproducing in both areas is performed. By sharing the clock of (1) as the least common multiple, it is not necessary to switch the clock for each track, and the same operation and effect as those of the above-described embodiment can be obtained.

Further, in the above embodiment, the least common multiple of the clock rate of each zone is used as the clock frequency, but recording / reproducing can be similarly performed with a clock having a frequency which is an integral multiple of this least common multiple. However, it is not realistic to raise the clock frequency too much. Also, depending on the system configuration, it may be possible to perform good recording / reproduction by slightly shifting the frequency from the least common multiple (or an integer multiple of the least common multiple) rather than using the signal of the least common multiple accurately as the clock. Even when the clock frequency becomes too high when the least common multiple is more accurately calculated, the least common multiple of the approximate value may be selected to select a clock having a low frequency.

Further, although the recording medium shown in FIG. 1 is zoning recording divided into two zones, when applied to the recording medium of this zoning recording, it is divided into three zones or three zones.
It can also be applied to zoning records divided into zones or more.
Of course, it can be applied to a recording medium that is not zoning recording. Furthermore, it is needless to say that the present invention is not limited to the above-mentioned embodiment and can take various other configurations.

[0050]

According to the present invention, when a reproduction-only area and a recordable area are mixed, a clock that is an integral multiple of the least common multiple of the recording clock rate of each area is used.
By recording or reproducing data, it is possible to perform recording processing or reproduction processing with a single clock in any area, simple control common to each area can be performed, and the configuration of the recording device or the reproduction device can be It will be easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a recording medium according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of each track according to an embodiment.

FIG. 3 is an explanatory diagram showing a track configuration of a zone A according to an embodiment.

FIG. 4 is an explanatory diagram showing a track configuration of a zone B according to an embodiment.

FIG. 5 is an explanatory diagram showing a data structure of a zone A according to an embodiment.

FIG. 6 is an explanatory diagram showing a data structure of a zone B according to an embodiment.

FIG. 7 is a block diagram showing a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 8 is a configuration diagram showing a main part of a recording / reproducing apparatus of an embodiment.

FIG. 9 is a configuration diagram showing a main part of a recording / reproducing apparatus of an embodiment.

FIG. 10 is a timing chart for explaining an embodiment.

FIG. 11 is a timing diagram for explaining an example.

FIG. 12 is a configuration diagram showing a recording medium according to another embodiment.

FIG. 13 is a configuration diagram showing a recording medium according to another embodiment.

FIG. 14 is a schematic diagram for explaining zoning recording.

FIG. 15 is a schematic diagram for explaining zoning recording.

[Explanation of symbols]

 1 Magneto-Optical Disk 4 System Controller 22 Clock Extraction Circuit 23 PLL Circuit (Phase Locked Loop Circuit) 32 AGC Circuit (Automatic Gain Adjustment Circuit) 33 Amplitude Detection Circuit 34 Clock Phase Detection Circuit 35 Central Controller 38 Data Detection Circuit 39 Clock Phase correction circuit

Claims (2)

[Claims] 1. A data recording area in which data reproduction-only area and data recordable area are mixed, and data is recorded in the data recording area at a clock rate different from the clock rate of data recorded in the data reproduction area. In the recording device for recording the data, the recording is performed at a clock rate that is an integer multiple of the least common multiple of the clock rate of the record data in the data reproduction-only area and the clock rate of the record data in the data recordable area. Recording device. 2. A reproducing apparatus in which a data reproduction exclusive area and a data recordable area coexist, and which reproduces data recorded at different clock rates in the data reproduction exclusive area and the data recordable area, A reproducing apparatus adapted to perform reproduction at a clock rate of an integer multiple of a least common multiple of the clock rate of the record data in the data reproduction exclusive area and the clock rate of the record data in the data recordable area.