JPH0554542A - Recording method and recording medium - Google Patents

Abstract

PURPOSE:To improve the data recording efficiency by only recording the reference data which are included in a first sector data and not recording the reference data in remaining sectors while recording plural sector data. CONSTITUTION:Plural tracks are formed on one magneto-optical disk which is divided into two, i.e., a track zone A being closer to the center of the disk and a track zone B being closer to the periphery of the disk. And for every zone, a zoning recording is performed by changing the clock rate of recorded data. And the zone A has thirty sectors each with thirtythree segments and the zone B has forty-five sectors each with twenty-two segments thus, making up the respective tracks. Each segment has four byte servo byte 6 and one byte sub-reference area, the zone A has a twenty byte data area and the zone B has a thirty byte data area. Gain adjustment reference data during a reproduction are recorded in the sub-reference 1 area. Having this arrangement, the data recording capacity is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method and recording medium 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 track in each zone is divided into two parts, and the constant rotation speed control for recording / reproducing at the same rotation speed is performed, and the clock rate or the rotation speed of the recorded data is changed between zone A and zone B. is there. By doing so, the recording capacity can be increased.

12 and 13 are views showing that the recording capacity is increased by this zoning recording. FIG. 12 shows an example in which zoning recording is performed by dividing into 3 zones, and FIG. 13 shows an example without zone division (rotation speed). 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. 12, the innermost track T1 of each zone 1, 2, 3 is
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.

When recording various data on such a magneto-optical disk, when the recording density is increased to some extent, the reference data is first recorded for a predetermined length so that the recorded data can be reproduced well. I am trying to do it. At the time of reproduction, the phase of the clock signal of the reproduction system circuit is matched with this reference data so that various data recorded subsequent to the reference data can be reproduced well.

[0007]

However, when the reference data is recorded, the recording area of the target data is reduced by the amount of this recording area, which is the same as the recording density is lowered. Become.

Therefore, it has been required to reduce the recording area of the reference data so that more target data can be recorded.

In view of the above points, the present invention has an object to provide a recording method and a recording medium capable of reducing the recording area of reference data.

[0010]

According to the present invention, in a recording method for recording sector-structured data including reference data necessary for reproduction, when recording data of a plurality of sectors, the reference contained in the data of the first sector is used. Only the data is recorded, and the reference data is not recorded in the remaining sectors.

Further, according to the present invention, when the recording area is divided into a plurality of sectors and the reference data necessary for reproduction is recorded, the data exceeding the capacity of one sector is recorded in consecutive sectors. The reference data recording area is provided only in the first sector of the continuous sectors.

Further, according to the present invention, the recording area is divided into a plurality of sectors, and in a recording medium on which reference data necessary for reproduction is recorded, a plurality of sets of data within the capacity of one sector are continuously spread over a plurality of sectors. When the data is recorded in a long time, the recording area for the reference data is provided only in the first sector of the continuous sectors.

[0013]

According to the present invention, the recording area of the reference data has the minimum capacity, and the recording capacity of the target information is increased correspondingly as the reference data is less.

[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 consists of a 4-byte servo byte, a 1-byte sub-reference area (sub-reference area), and a 20-byte (for zone A) or 30-byte (for zone B) data area. Composed of. 4 at the beginning of each segment
The servo byte is a so-called pre-pit in which data is previously recorded in pits on the disk, 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.

Further, in the 1-byte sub reference area and the 20-byte or 30-byte data area following the servo byte, data is recorded by the magneto-optical effect by a circuit having a structure described later. Here, in the 1-byte sub-reference area, reference data for gain adjustment at the time of reproduction is recorded at the same time when data is recorded in the data area. In this case, the reference data recorded in the reference area described later and the reference data recorded in the sub reference area may be the same data.

Also, 20 bytes and 30 in the data area
The difference in recording capacity from bytes is due to the difference in recording clock rate between zone A and zone B. That is, the zoning recording sets the linear recording density of the innermost track of zone A and the linear recording density of the innermost track of zone B to be substantially the same. With such a setting, the recording capacity of the data area is set. Changes from zone to zone.

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, and at the time of reproduction, the reproduction signal of the reference data and the system clock are synchronized with each other and recorded in the entire area of the data area of the first segment. In the data area from the 2nd segment to the 33rd segment, 20 for each segment.
Data is recorded byte by byte.

In this example, when one set of data is continuously recorded over a plurality of sectors, the reference area is provided only in the first segment of the first sector among the plurality of consecutive sectors. The data area of the first segment of the other sector is used as a data area for recording target data. However, a 1-byte sub reference area must be provided for each segment.

Therefore, in the case of zone A, one sector
20 bytes of phase adjustment reference data and 33 bytes (1
Byte reference data for gain adjustment of 33 segments) and various data (target data) of 640 bytes (20 bytes 32 segments) are recorded. Also,
As described above, when a set of data is recorded over a plurality of sectors, in one sector of zone A other than the first sector, 33 bytes (1 byte × 33 segments) of gain adjustment reference data and 660 Byte (20 bytes x
Various data (target data) of 33 segments) are recorded.

Further, in the case of zone B, as shown in FIG. 6, 20 bytes of the data area of the first segment (first segment) of the 22 segments forming one sector is set as the reference area, When recording data in this sector, 20-byte reference data is recorded. The reference data of the zone B is the same as the reference data of the zone A described above, and the remaining section (10 bytes) of the data area of the first segment is a data area in which the data is recorded. In the data area from the second segment to the 22nd segment, 30 bytes of data are recorded in each segment. Also in the case of this zone B, when recording one set of data continuously over a plurality of sectors, the reference area is provided only in the first segment of the first sector of the plurality of consecutive sectors. , 30 bytes of the data area of the first segment of the other sector are used for data recording as a data area.

Therefore, in the case of zone B, one sector
20 bytes of phase adjustment reference data and 22 bytes (1
Bytes × 22 segments) of gain adjustment reference data and 640 bytes (10 bytes + 30 bytes × 21 segments) of various data are recorded. Further, when recording one set of data across a plurality of sectors, 22 bytes (1
Bytes × 22 segments) gain adjustment reference data and 660 bytes (30 bytes × 22 segments) of various data are recorded.

Thus, in zone A and zone B, 1
The storage capacities of the sectors are 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 to be 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 a predetermined read process 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 FIGS. 8 and 9, and in this example, the magneto-optical disk 1 is recorded as zoning divided into two zones. Therefore, two types of read clocks are required. That is, when the configuration of the clock generation circuit is shown in FIG.
The reproduction signal supplied to the clock 5 is supplied to the clock pit extraction circuit 2
2 and the data of the servo byte is extracted by the clock pit extraction circuit 22. Then, the data of the extracted servo bytes is supplied to the first PLL circuit (phase locked loop circuit) 23 and the second PLL circuit 24. In this case, the first PLL circuit 23 is a circuit for converting input data into a signal having a frequency of 200 times.
A signal having a doubled frequency is supplied to the terminal 25 as a zone A data detection clock. In addition, the second PLL circuit 24
Is a circuit for converting the input data into a signal having a frequency of (200 × 1.5) times, that is, 300 times.
Supply to.

The structure of the read circuit 15 for extracting the reproduction 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. The gain adjustment in this case is performed based on the gain adjustment reference data recorded in the sub reference area, which is prepared by 1 byte for each segment.

Further, correction data for the read clock is created based on the clock phase detection data supplied from the clock phase detection circuit 34, and this correction data is supplied to the clock phase correction circuit 39. In this case, the clock phase detection is performed based on the reference data of this area when the phase adjustment reference data is recorded in the data area of the first segment of each sector (that is, when the reference area exists). Then, the clock phase correction circuit 39 performs phase adjustment (phase shift) of the data detection clocks obtained at the terminals 25 and 26 based on the correction data, and supplies one of the adjusted clocks to the data detection circuit 38. ..

In this case, the clock supplied from the clock phase correction circuit 39 to the data detection circuit 38 is selected according to the zone of the reproducing portion of the disc. That is, when the zone A is reproduced, the clock output from the first PLL circuit 23 is phase-corrected and supplied to the data detection circuit 38, and when the zone B is reproduced, the second PL circuit is reproduced.
The clock output from the L circuit 24 is phase-corrected and supplied to the data detection circuit 38. Therefore, when reproducing the track of the zone A, as shown in FIG. 5, the reproduction data of the servo byte multiplied by 200 in the first PLL circuit 23 becomes the system clock and the read clock at the same frequency. .. Further, when reproducing the track of the zone B, as shown in FIG. 6, the reproduction data of the servo byte is multiplied by 200 in the first PLL circuit 23 to become the system clock for performing the control based on the servo byte. The read clock is multiplied by 300 in the second PLL circuit 24.

The data detection circuit 38 is supplied with the reproduction signal whose gain has been adjusted by the AGC circuit 32, and based on the 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 indicates 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 detecting circuit 37, and this address detecting 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 processing is performed at the timings shown in FIG. That is,
In the case of zone A, as shown in FIG. 10A, during reproduction of 1-byte gain adjustment reference data of each segment of each sector, as shown in FIG. 10B, the amplitude detection circuit 33 reproduces this reference data. As shown in FIG. 10C, the clock phase detection circuit 34 detects the amplitude and, in the case of the first segment, continuously reproduces the phase adjustment reference data.
The reproduction phase of this reference data is detected by. Then, the central controller 35 determines the detection state of each of the reference data, and controls the gain adjustment amount in the AGC circuit 32 and the phase correction amount in the clock phase correction circuit 39. And
With the gain adjustment and the phase correction performed in this way, as shown in FIG. 10D, the data recorded in the data area from the second segment is decoded. And
When the data being reproduced at this time is recorded over a plurality of sectors, as shown in FIG. 10A, the phase adjustment reference data is not reproduced even in the first segment in the sector where the data is continuous, Since the data is recorded after the data of the previous sector, the clock phase at the time of recording is the same, and by continuing the phase adjustment state at the time of reproduction of the previous sector, good reproduction is continuously performed. ..

In the case of zone B, as shown in FIG. 11A, during reproduction of 1-byte gain adjustment reference data of each segment of each sector, as shown in FIG. 11B,
The amplitude detection circuit 33 detects the reproduction amplitude of this reference data, and, in the case of the first segment, while the phase adjustment reference data is being reproduced subsequently, as shown in FIG. After detecting the reproduction phase of the data, as shown in FIG. 11D, subsequently, the 10-byte data recorded in the first segment is decoded in an adjusted state based on both reference data. And after that, Zone A
As in the case of (3), as long as the data is continuous, the same phase adjustment state is continued to decode the data.

Although not shown, sample servo control is performed for each segment based on the data reproduced from the servo bytes of each segment, and the track address and sector address recorded in the servo bytes are recorded. Data decoding is also performed.

Since recording / reproducing is performed by the magneto-optical disk 1 in this manner, the magneto-optical disk 1 has a large data recording area and a large data recording capacity. That is, when a set of data is recorded over a plurality of sectors, the reference data for phase adjustment of the reproduction clock is recorded only in the first segment of the first sector, so that the first segment of all sectors is recorded. The data recording area is larger than that in the case of recording the reference data. For example, when the reference data is recorded in the first segment of all the sectors, the reference data of 20 bytes is recorded (excluding the reference data of the sub reference area), so that a data area in which various data of 640 bytes can be recorded However, the sector that does not record the reference data in the first segment has a data area in which various data of 660 bytes can be recorded.
The recording capacity of 20 bytes per sector increases.

Here, as an example of data to be actually recorded, for example, in the case of data of the CD-ROM format, one unit of data is 323 including the error correction code.
It is 4 bytes. This 3234-byte data is shown in Figure 2.
When recording is performed on the magneto-optical disk 1 having the sector structure shown in FIG. 3, in the case of this example in which the reference data is recorded only in the first sector, it becomes possible to perform recording in 5 sectors. That is,
In the case of this example, 3280 bytes (6
It has a data recording capacity of 40 bytes + 660 bytes × 4), and one unit of data recording in the CD-ROM format of 3234 bytes is possible with these 5 sectors. On the other hand, when the reference data is recorded in all the sectors as in the conventional case, 5200 sectors have 3200 bytes (640 bytes x 640 bytes).
Only the data recording capacity of 5), 3234-byte CD
-Recording efficiency is very poor because 6 sectors are required to record one unit of data in the ROM format, and one sector needs to be increased for only 34 bytes.

By recording / reproducing as in this example, the data in the CD-ROM format can be recorded very efficiently, and the data recording efficiency is good. In this case, in this example, the recording capacity of one sector is the same in the case of zone A and in the case of zone B, and data processing common to each zone can be performed even in zoning recording.

In the above embodiment, the case where the data exceeding the capacity of one sector is recorded over a plurality of sectors has been described. However, when the data having a capacity less than or equal to one sector is collectively recorded in a plurality of sectors. However, the reference data of the first segment of the first recorded sector may be commonly used. That is, for example, when a plurality of sets of data of several hundred bytes are recorded consecutively in a plurality of sectors, after the reference data is recorded in the first segment of the first sector, the phase adjustment reference may be changed even if the data set changes. It is also possible to record only the target data continuously without recording the data. By doing so, it is possible to efficiently record even data having a capacity of one sector or less.

In the above embodiment, the zoning recording is divided into two zones, but it can be applied to the zoning recording divided into three zones or more than three zones. Further, the present invention is not limited to the above-mentioned embodiment, and needless to say, various other configurations can be adopted.

[0044]

According to the present invention, the recording area of the reference data has the minimum capacity, and the recording capacity of the target data is increased by the amount of the reference data, so that the data can be efficiently recorded on the recording medium. become.

[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 schematic diagram for explaining zoning recording.

FIG. 13 is a schematic diagram for explaining zoning recording.

[Explanation of symbols]

1 Magneto-Optical Disk 4 System Controller 23 First PLL Circuit (Phase Locked Loop Circuit) 24 Second PLL Circuit 32 AGC Circuit (Automatic Gain Adjusting Circuit) 33 Amplitude Detection Circuit 34 Clock Phase Detection Circuit 35 Central Control Unit 39 Clock phase correction circuit

Claims (3)

[Claims] 1. A recording method for recording sector-structured data including reference data necessary for reproduction, wherein when recording data of a plurality of sectors, only the above-mentioned reference data contained in the data of the first sector is recorded, and the rest. A recording method in which the above reference data is not recorded in the sector. 2. A recording medium in which a recording area is divided into a plurality of sectors and reference data necessary for reproduction is recorded, and when the data exceeding the capacity of one sector is recorded in consecutive sectors, this continuation is performed. A recording medium in which a recording area for the reference data is provided only in the first sector of the selected sectors. 3. A recording medium in which a recording area is divided into a plurality of sectors and reference data necessary for reproduction is recorded, and a plurality of sets of data within a capacity of one sector are continuously spread over a plurality of sectors. A recording medium provided with a recording area for the reference data only in the first sector of the continuous sectors when recorded.