JP3248197B2 - Recording method of disk-shaped recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a preferred recording method is applied for example in a magneto-optical disk.

[0002]

2. Description of the Related Art In a disk-shaped recording medium, a constant rotational speed (CA) for recording / reproducing at a constant rotational speed is used to control the rotational speed when recording / reproducing data.
V) control and constant linear velocity (CLV) control for performing recording / reproduction 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 radius is constant.
Since control data such as a track address can be recorded in a line in the direction, an address search can be easily performed. In the case of constant linear velocity control, it is necessary to change the rotation speed according to the position of the optical pickup, so the speed control system becomes complicated, but since the recording density can be kept constant,
Although the amount of recorded information can be increased compared to the constant rotation speed control, recording of control data such as track addresses is half
Since it is difficult to perform the alignment in the radial direction, there is a problem that the address search takes time and effort.

Generally, in the case of a magneto-optical disk having a large data recording capacity, in order to easily search for required data, data recording / reproducing is performed by constant rotation speed control in which an address search is easy. Many are made to be performed. However, as described above, there is a disadvantage that the recording capacity is lower in the constant rotation speed control than in the linear velocity constant control, and a zoning recording method has been proposed as a method of increasing the recording capacity in the recording by the constant rotation speed control.

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

FIGS. 12 and 13 show that the recording capacity is increased by this zoning recording. FIG. 12 shows an example in which zoning recording is performed by dividing into three zones, and FIG. (In the case of constant control), and shows an example in which data is recorded in pits on a disk. Here, when zoning recording is performed as shown in FIG. 12, the innermost track T1 of each of the zones 1, 2, 3 is set.
1, the recording linear densities of T21 and T31 are set to be the same. Then, in each of the zones 1, 2, and 3, the rotation speed constant control is performed (the clock rate or the rotation speed of the recording data changes when the zone changes), so that the recording linear density decreases as the track becomes closer to the outer periphery. . By dividing into a plurality of zones in this manner, the linear recording density of one track can be returned to the highest state every time the zone changes, and the linear recording density can be maximized as in the case where no zone division is performed as shown in FIG. The recording capacity can be greatly increased as compared with a case where the recording capacity is sequentially reduced to the outer track. That is, the outermost track when the zone is not divided has a very low linear recording density. However, when the outermost track is divided into a plurality of zones, a certain linear recording density is secured even in the outermost track. In this case, the recording capacity can be further increased by increasing the number of zones.

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

[0007]

However, when the reference data is recorded, the recording area of the target data is reduced by the recording area, and the recording density is lowered. Become.

For this reason, there has been a demand for reducing the recording area of the reference data so that more target data can be recorded.

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

[0010]

According to the present invention, there are provided a plurality of cells.
Disc with multiple tracks consisting of
Recording data across multiple sectors on a recording medium
Sometimes, data is recorded across multiple sectors
For detecting the quality of the recording signal in the first sector of the
The data is recorded.

In this case, the track is provided with a servo control.
Your data is recorded at predetermined intervals in advance,
Each sector consists of multiple segments separated by servo control data.
The reference data consists of the first sector.
Is recorded only in the first segment.
You.

[0012]

[0013]

According to the present invention, the recording area of the reference data has the minimum capacity, and the smaller the reference data, the more the recording capacity of the target information increases.

[0014]

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

In this embodiment, the present invention is applied to a magneto-optical disk capable of freely recording and reproducing data, and zoning recording is performed on the magneto-optical disk as shown in FIG. That is, a plurality of tracks are formed concentrically on one magneto-optical disk, and the two tracks are divided into a zone A formed by a track closer to the center and a zone B formed by a track closer to the outer periphery. In this case, for example, assuming that the size of the magneto-optical disk 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. In each zone, data is recorded / reproduced at a constant rotation speed. In this example, zoning recording in which the recording density is changed by changing the clock rate of the recording data for each zone is performed.

As shown in FIG. 2, one annular track in each of the zones A and B is composed of 990 segments. In this case, each one-unit segment includes 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. It consists of. 4 at the beginning of each segment
The servo bytes are so-called pre-pits in which data is previously recorded in pits on a disk, and sample servo control is performed by the data of the pre-pits during recording / reproduction. Also, a track address and a sector address are recorded as data based on the pre-pits, and are used at the time of a search.

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

In the data area, 20 bytes and 30 bytes
The difference in the recording capacity between bytes is due to the difference in the 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. Changes for each zone.

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

When recording data, data is recorded in units of this sector. Referring to the configuration 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 constituting one sector is set as a reference area. 20 bytes of reference data (reference data) are recorded when data is recorded in the sector. This reference data is for detecting the quality of the recording signal during reproduction,
Specifically, a signal of a constant frequency is recorded, and at the time of reproduction, a reproduction signal of the reference data is synchronized with a system clock and the like, and is recorded in all sections of the data area of the first segment. Then, in the data area from the second segment to the 33rd segment, 20
Data is recorded byte by byte.

In this embodiment, when a set of data is continuously recorded over a plurality of sectors, a reference area is provided only in the first segment of the first sector in the plurality of continuous sectors. The data area of the first segment of another sector is used for recording target data as a data area. However, a 1-byte sub-reference area is always provided for each segment.

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

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 constituting one sector are used as a reference area. 20 bytes of reference data are recorded when data is recorded in this sector. The reference data of the zone B is the same as the reference data of the zone A, and the remaining section (10 bytes) of the data area of the first segment is a data area in which data is recorded. In the data area from the second segment to the 22nd segment, 30 bytes of data are recorded in each segment. In the case of zone B, when one set of data is continuously recorded over a plurality of sectors, a reference area is provided only in the first segment of the first sector in the plurality of continuous sectors. In the data area of the first segment of the other sector, all 30 bytes are used as data areas for data recording.

Therefore, in the case of zone B, one sector
20 bytes of reference data for phase adjustment and 22 bytes (1
Reference data for gain adjustment of bytes × 22 segments and various data of 640 bytes (10 bytes + 30 bytes × 21 segments) are recorded. When a set of data is recorded over a plurality of sectors, one sector of the zone A and 22 bytes (1
The reference data for gain adjustment of bytes × 22 segments and various data of 660 bytes (30 bytes × 22 segments) are recorded.

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

Next, a recording / reproducing apparatus for a magneto-optical disk on which each track is formed as described above will be described.

FIG. 7 is a diagram showing the configuration of a recording / reproducing apparatus for a magneto-optical disk to which the present invention is applied. 1 indicates a magneto-optical disk, and this magneto-optical disk 1 has a zone A as shown in FIG. And zoning recording which is divided into two zones, ie, zone B and zone B. The magneto-optical disk 1 is driven to rotate by a spindle motor 2, and signals are recorded / reproduced by an optical pickup 3 having a semiconductor laser or the like. The rotation control of the spindle motor 2 and various controls (such as seek control) 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 transmitted from a recording data forming circuit (not shown) to the RA.
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 recording circuit 13 performs modulation for recording, and the modulated recording data is supplied to the writing circuit 14. A predetermined writing process is performed at 14, and the processed recording data is supplied to the optical pickup 3, and writing is performed by the magneto-optical effect.

The data written on the magneto-optical disk 1 in this manner is read by the optical pickup 3 and supplied to a read circuit 15, which demodulates the data subjected to a predetermined read process by the read circuit 15. 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, data stored in the RAM 12 is read and supplied to a reproduced data output circuit (not shown).

FIGS. 8 and 9 show a detailed structure of the readout circuit 15 and its surroundings necessary for reproduction. In this embodiment, the magneto-optical disk 1 is divided into two zones for zoning recording. Therefore, two types of read clocks are required. That is, FIG. 8 shows the configuration of the clock generation circuit.
5 is supplied to a clock pit extraction circuit 2
2 and the clock pit extracting circuit 22 extracts servo byte data. Then, the extracted servo byte data 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.
The signal of the double frequency is supplied to the terminal 25 as a data detection clock for the zone A. Also, the second PLL circuit 24
Is a circuit for converting input data into a signal having a frequency of (200 × 1.5) times, that is, a signal having a frequency of 300 times.
To supply.

FIG. 9 shows the configuration of the read circuit 15 for extracting reproduced data based on the clock generated in this manner.
AGC circuit (automatic gain adjustment circuit) 32, amplitude detection circuit 33, and clock phase detection circuit 3
And 4. 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 the two detection circuits 33 and 34 is supplied to a central control device (CPU) 35 for reading control. Then, the central control device 35 controls the gain adjustment amount of the reproduction signal performed by the AGC circuit 32 based on the supplied amplitude detection data. In this case, the gain adjustment is performed based on gain adjustment reference data recorded in a sub-reference area prepared for each byte in each segment.

Further, based on the clock phase detection data supplied from the clock phase detection circuit 34, correction data of the read clock is created, 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 the area when the phase adjustment reference data is recorded in the data area of the first segment of each sector (that is, when there is a reference area). Then, the clock phase correction circuit 39 adjusts the phase (phase shift) of the data detection clock 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 selection of the clock supplied from the clock phase correction circuit 39 to the data detection circuit 38 is performed according to the zone of the reproduction position of the disk. That is, when the zone A is being 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 being reproduced, the second PL is output.
The clock output from the L circuit 24 is phase-corrected and supplied to the data detection circuit 38. Therefore, at the time of reproduction of the track in zone A, as shown in FIG. 5, the reproduction data of the servo byte multiplied by 200 by the first PLL circuit 23 becomes the system clock and the read clock at the same frequency. . In reproducing the track in zone B, as shown in FIG. 6, the reproduction data of the servo byte is multiplied by 200 by the first PLL circuit 23 to be a system clock for performing control based on the servo byte. , 300 times by the second PLL circuit 24 becomes a read clock.

The data detection circuit 38 is supplied with the reproduced 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 at a terminal 40.
Is supplied to the subsequent circuit via

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

When data recorded on the magneto-optical disk 1 is reproduced by the circuit configured as described above, FIG.
The processing is performed at the timing shown in FIG. That is,
In the case of zone A, as shown in FIG. 10A, while the 1-byte gain adjustment reference data of each segment of each sector is being reproduced, the amplitude detection circuit 33 reproduces this reference data as shown in FIG. 10B. While the amplitude is detected, and in the case of the first segment, the phase adjustment reference data is subsequently reproduced, as shown in FIG.
Detects the reproduction phase of this reference data. Then, the central control unit 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 phase correction performed in this way, as shown in FIG. 10D, decoding of data recorded in the data area from the second segment is performed. And
At this time, if the data being reproduced 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 following the data of the previous sector, the phase of the clock at the time of recording is the same, and good reproduction is continuously performed by continuing the phase adjustment state at the time of reproduction of the previous sector. .

In the case of zone B, as shown in FIG. 11A, while reproducing the 1-byte gain adjustment reference data of each segment of each sector as shown in FIG.
While the amplitude detection circuit 33 detects the reproduction amplitude of the reference data, and in the case of the first segment, during reproduction of the phase adjustment reference data, the clock phase detection circuit 34 as shown in FIG. After detecting the reproduction phase of the data, as shown in FIG. 11D, 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 (1), as long as the data continues, the same phase adjustment state is continued to decode the data.

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

Recording / reproducing by the magneto-optical disk 1 in this manner allows the magneto-optical disk 1 to have 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. The data recording area is larger than when the reference data is recorded. For example, when the reference data is recorded in the first segment of all the sectors, 20 bytes of reference data are 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, a sector in which reference data is not recorded 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 in a CD-ROM format, one unit of data is 3234 bytes including a subcode and an error correction code. When this 3234-byte data is recorded on the magneto-optical disk 1 having the sector configuration shown in FIGS. 2 and 3, in this example in which reference data is recorded only in the first sector, it is possible to record in 5 sectors. become. That is, in the case of the present example, 328 of five consecutive sectors are used.
It has a data recording capacity of 0 bytes (640 bytes + 660 bytes × 4), and can record one unit of data in a CD-ROM format of 3234 bytes in these five sectors. On the other hand, when the reference data is recorded in all the sectors as in the related art, 3200 bytes (6
It has only a data recording capacity of 40 bytes x 5), and 3234
In order to record one unit of data in the byte CD-ROM format, six sectors are required, and since only 34 bytes are required, it is necessary to increase two sectors, which is very poor in recording efficiency.

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

In the above embodiment, the case where data exceeding the capacity of one sector is recorded over a plurality of sectors has been described. However, the case where data less than the capacity of one sector is collectively recorded in a plurality of sectors. Alternatively, the reference data of the first segment of the first recorded sector may be commonly used. That is, for example, when recording a plurality of sets of data of about several hundred bytes continuously in a plurality of sectors, after recording the reference data in the first segment of the first sector, even if the data set changes, the phase adjustment reference Instead of recording the data, only the target data may be continuously recorded. 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. However, the present invention can be applied to zoning recording divided into three zones or three or more zones. In addition, the present invention is not limited to the above-described embodiment, but may take various other configurations.

[0044]

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

[Brief description of the 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 one embodiment.

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

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

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

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

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

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

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

FIG. 10 is a timing chart for explaining one embodiment;

FIG. 11 is a timing chart for explaining one embodiment;

FIG. 12 is a schematic diagram illustrating zoning recording.

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

[Explanation of symbols]

Reference Signs List 1 magneto-optical disk 4 system controller 23 first PLL circuit (phase locked loop circuit) 24 second PLL circuit 32 AGC circuit (automatic gain adjustment circuit) 33 amplitude detection circuit 34 clock phase detection circuit 35 central control device 39 Clock phase correction circuit

Continuation of the front page (56) References JP-A-60-133585 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/12

Claims (2)

(57) [Claims] A plurality of sectors each comprising a plurality of sectors;
The plurality of sections are placed on a disk-shaped recording medium having a rack.
When recording data across data,
At the beginning of the sectors
Record reference data to detect the quality of the recording signal
Recording method of a disc-shaped recording medium to be used 2. The servo control data is recorded on the track.
Are recorded in advance at predetermined intervals, and
Data consists of multiple segments separated by servo control data
And the reference data is the first sector.
2. The data according to claim 1, which is recorded only in the first segment of
A recording method for a disk-shaped recording medium.