JP2002279734A - Disk medium on which multilayer recording is possible, and disk unit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk medium with which recording and reproduction at constant speed can be carried out over the entire multilayered disk and a high-speed search and high bit rate recording can simultaneously be realized, and to provide a disk unit using the same. SOLUTION: When assuming that the disk medium has K layer(s) (K>=1) and the disk unit has L pieces of heads (L is an even number of two or more), the speed of disk revolution is fixed, every Int(K/L)-sheet of layers (wherein, Int is the maximum integer not exceeding the value) is simultaneously scanned by all heads, and (K/ L-Int(K/L))-sheet of layers are scanned simultaneously at arbitrary time. A disk spiral is constituted so that remaining L/2-piece of heads may perform scanning from an outer periphery toward an inner periphery while L/2-piece of heads perform scanning from the inner periphery toward the outer periphery, and so that the remaining L/2- piece of heads may perform scanning from the inner periphery toward the outer periphery while the L/2-piece of heads perform scanning from the outer periphery toward the inner periphery. The ratio of a data bit rate to be recorded or reproduced from each head is made coincident approximately with the ratio of a disk diameter at the position of each head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records and reproduces digital data or digital image / audio / system data on / from a multi-layer recordable optical disk (including a magneto-optical disk and a phase change disk) and a magnetic disk medium. The present invention relates to a disk medium and a disk device.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application No. Hei 10-223849.
As shown in the figure, when data is recorded on a multilayer disc, recording is performed on the first layer with one head, and after the recording is completed on the entire surface, the head jumps from the first layer to the second layer. Then, recording is performed on the second layer, and after the recording is completed on the entire surface of the second layer, the head jumps from the second layer to the third layer, and performs recording on the third layer. This operation was repeated until recording was completed for all layers.

FIG. 38 shows an operation example of the land / groove track at this time. In FIG. 38, the innermost circumference Zo
In ne0, the head that has scanned the land track once has jumped to the inner groove track, and the head that has scanned the groove track once has jumped to the inner land track, and this is repeated over Zone 0 to Zone 5. Thereafter, the first layer is determined to be the end of the entire recording, and the Z
one11, jump to groove track. Then, the head that scans the groove track one round jumps to the land track on the outer circumference side, and the head that scans the land track one round jumps to the groove track on the outer circumference side, and after repeating this over Zone 11 to Zone 6, The recording on the present disc is terminated with the entire surface of the second layer also terminated.

[0004]

At present, as a typical example of a disk recording method, an MCLV (Modified Constant Line) is used.
ar Velocity), MCAV (Modified Constant Angular)
Velocity). The MCLV divides the disk into multiple zones and changes the number of bits per track and the disk rotation speed for each zone. However, since the disk rotation speed is changed, high-speed response to head movement is difficult, and high-speed search is realized. There is a problem that can not be. In addition, MCAV divides a disk into a plurality of zones, sets the disk rotation speed constant, and changes the number of bits per track for each zone, and records, for example, the video bit rate when recording video is a low bit rate. In order to match the inner zone on the outer side, one track is recorded by multiple rotations in the outer zone. That is, the high bit rate zone on the outer side cannot be used efficiently, and the recording bit rate must be increased as a whole. There is a problem that can not be.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a disk medium having K layers (K ≧ 1) and L disk heads (L is an even number of 2 or more). ), The disk rotation speed is fixed, and when K is divisible by L, all the heads scan K / L layers simultaneously, and L / 2 heads move from the inner circumference to the outer circumference. During scanning, the remaining L / 2 heads scan from the outer circumference toward the inner circumference.
When two heads scan from the outer circumference to the inner circumference, a track spiral is configured so that the remaining L / 2 heads scan from the inner circumference to the outer circumference, and K is not divisible by L At the same time, Int (K / L) for all heads
Layers (where Int is the maximum integer not exceeding the value), and simultaneously (K / L-I
nt (K / L)) layers are scanned, and when L / 2 heads are scanning from the inner circumference to the outer circumference,
When the remaining L / 2 heads scan from the outer circumference to the inner circumference, and when the L / 2 heads scan from the outer circumference to the inner circumference, the remaining L / 2 heads scan. The track spiral is configured to scan from the inner circumference to the outer circumference, and the ratio of the data bit rate to be recorded or reproduced from each head approximately matches the ratio of the disk diameter at the position of each head. It is.

[0006]

According to the present invention, a constant recording / reproducing speed can be realized over the entire disk by the above-described structure. Further, in a multi-layer disc, the shortest bit wavelength of all layers on the entire surface can be made substantially constant, and high-speed search and high bit-rate recording can be simultaneously realized.

[0007]

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an embodiment in which a two-layer disc and two heads are used.

A head A scans the first layer from the inner periphery to the outer periphery, and a head B scans the second layer from the outer periphery to the inner periphery.

FIG. 21 shows the track configuration of the disk at this time. In FIG. 21, reference numeral 211 denotes a number called a zone number or a clock block number, which indicates an area in the track direction. 212 is a land track and 213 is a groove track. This embodiment exemplifies a land-groove track configuration. land/
As shown in FIG. 38, the scanning order of the grooves may be such that a one-track return to the groove or the land track is performed after one track of the land or the groove is scanned, or a plurality of tracks are returned to the groove or the land track after the multiple tracks of the land or the groove are scanned. May be. Also, it does not have to be a land groove track disk,
A disk composed of spiral tracks having only grooves or lands may be used.

Reference numeral 214 denotes a scanning start position of the first layer, and 215 denotes a scanning start position of the second layer.

In the first layer, the A head starts scanning from the innermost circumference 214 to the outermost circumference, and in the second layer, the B head starts scanning from the outermost circumference 215 to the innermost circumference.

Here, from FIG. 1 and FIG.
Although the heads seem to hit each other at the center of the disk, the two heads are actually arranged at separate positions as shown in FIG. The displacement between the two heads is 18 shown in FIG.
The angle may not be 0 degree, but may be 90 degrees or another angle.
Also, from FIGS. 21 and 27, it can be seen that scanning does not start simultaneously at 214 and 215, but at the time of actual disk recording / reproduction, 215 is shifted with respect to 214 by an angle at which both heads are shifted. By reproducing at a shifted angle, the reproduction timing may be adjusted as a result, or the output of the first layer data and the second layer data may be recorded at a timing shifted by a buffer at the time of recording so that they coincide on the disk. In the reproduction, the first layer and the second layer are reproduced at a timing shifted from each other, and the data is buffered so that the final timing is made to coincide with the drive by performing an operation on the drive side.

Next, the data arrangement will be described.

FIG. 29 shows that the first layer has six zones (Zone 0).
~ Zone5), the second layer in 6 zones (Zone6 ~ Zo)
ne11). Reference numeral 291 indicates a zone number.

FIG. 30 shows tracks and ECs in the first layer.
4 shows an example of a C block configuration. 301 is a zone number, 302 is a track number, and 303 is an ECC block number.

In Zone 0, 1.00 EC per track
Arrange C blocks, 8 ECC blocks on 8 tracks,
In Zone 1, 1.25 ECC blocks are arranged in one track, and 10 ECC blocks in Zone 8 and Zone 2
In this example, 1.50 ECC blocks are arranged in one track,
A track has 12 ECC blocks, Zone 3 has 1.75 ECC blocks on one track, 8 tracks has 14 ECC blocks, and Zone 4 has 2.75 ECC blocks on one track.
Arrange 00ECC blocks and set 16 ECC with 8 tracks
2.25 ECC per track in block and Zone5
The blocks are arranged, and there are a total of 78 ECC blocks of 18 ECC blocks in 8 tracks.

FIG. 31 shows tracks and ECs in the second layer.
4 shows an example of a C block configuration. 311 is a zone number, 312 is a track number, and 313 is an ECC block number.

In Zone 11, 2.25E per track
CC block is arranged, 18 ECC blocks are arranged in 8 tracks. In Zone 10, 2.00 ECC blocks are arranged in 1 track, 16 ECC blocks are arranged in 8 tracks, and Zon
In e9, 1.75 ECC blocks are arranged in one track, in eight tracks, 14 ECC blocks are arranged, in Zone 8, 1.50 ECC blocks are arranged in one track, in eight tracks, 12 ECC blocks are arranged, and in Zone 7, 1.25 ECC blocks are arranged in one track. , 8 tracks have 10 ECC blocks, Zone 6 has 1.00 ECC blocks on one track, and 8 tracks have 8 ECC blocks.
The total number of CC blocks is 78 ECC blocks.

Next, the operation will be described.

It is assumed that the disk rotation speed is 50 rps.

In the A head, the first layer is the innermost zone Zon.
e0, scanning starts from track 0 toward the outermost periphery.
At this time, one ECC block (ECC block 0) is recorded / reproduced in one round, that is, in 20 msec. In the B head, the second layer has the outermost zone Zone 11 and the track 47.
The scanning starts from to the innermost circumference. At this time, one lap,
That is, a 2.25 ECC block (1/4 of ECC blocks 78, 79, and 80) is recorded / recorded in 20 msec.
Reproduce. That is, for both A / B heads, one round, 20 msec
The 3.25 ECC block is recorded / reproduced by c.

Next, head A scans Zone 0, track 1 and head B scans Zone 11, track 46.
3.25 ECC blocks are recorded in 20 msec for one round /
Reproduce.

Thereafter, similarly, head A is Zone 0, tracks 2 to 7, head B is Zone 11, tracks 45 to 45.
40 scans, 3.25 ECs per round, 20 msec
Record / reproduce C block.

Next, the A head is in Zone 1, track 8
Is scanned, and 1.25 ECC blocks (1/4 of ECC blocks 8 and 9) are recorded / reproduced. The B head scans the Zone 10 and the track 39, and records / reproduces 2 ECC blocks (ECC blocks 96 and 97). That is, the A / B head records / reproduces 3.25 ECC blocks per 20 msec for one round.

Similarly, the A head and the B head are
ne1 and Zone10, Zone2 and Zone9, Zo
ne3 and Zone8, Zone4 and Zone7, Zone
e5 and Zone6 are scanned at the same time.
3.25 ECC blocks are recorded / reproduced per 20 msec in one round.

Finally, the A-head scans Zone 5, the track 47, and records / reproduces 2.25 ECC blocks (1/4, 76, 77 of the ECC blocks 75).
The B head scans Zone 6, track 0, and 1 ECC
The block (ECC block 155) is recorded / reproduced.
That is, the A / B head records / reproduces 3.25 ECC blocks per 20 msec for one round.

By using two heads at the same time, a recording / reproducing speed of 3.25 ECC blocks per 20 msec, ie, 162.5 ECC blocks / sec, can be realized over the entire disk.

FIG. 2 shows another embodiment in which a two-layer disc and two heads are used.

The head A scans the first layer from the outer periphery to the inner periphery, and the head B scans the second layer from the inner periphery to the outer periphery.

The track configuration of the disk is similar to that of FIG.
1, the rotation direction or spiral configuration of the disk and the starting position of the head are reversed.

The zone, track and ECC block configurations can be shown in FIGS. 29, 30 and 31 in the same manner as described above.

Here, the description of the operation is omitted.

FIG. 3 shows an embodiment in which a two-layer disc and four heads are used.

Head A scans the first layer from the inner circumference to the middle circumference, head B scans the first layer from the middle circumference to the outer circumference, head C scans the second layer from the outer circumference to the middle circumference, and head D scans the The second layer is scanned from the middle to the inner circumference.

The track configuration of the disk is similar to that of FIG.
1 can be indicated.

Here, from FIG. 3 and FIG.
The head, the C head, and the D head appear to hit each other at the center of the disk.
As shown in FIG. The deviation between the two heads may not be 90 degrees shown in FIG.
Other angles may be used. From FIGS. 21 and 28, it seems that each head does not start scanning at the same time. However, at the time of actual disk recording / reproduction, recording is performed by shifting each head by an offset angle and reproducing at an offset angle. By doing
As a result, the playback timing may be adjusted, or
At the time of recording, recording starts at the timing when the output of each head is shifted by the buffer, so that they match on the disc,
During playback, playback starts at the timing when each head is shifted,
The data is dealt with by performing operations such as matching the final timing by buffer processing on the drive side.

The zone, track and ECC block configurations can be shown in FIGS. 29, 30 and 31 in the same manner as described above.

Next, the operation will be described.

It is assumed that the disk rotation speed is 50 rps.

The A head starts scanning the first layer from Zone 0 and Track 0, and makes one ECC block (ECC) in one round.
Block 0) is recorded / reproduced. The B head starts scanning the first layer from Zone 3 and the track 24, and performs 1.
75 ECC blocks (ECC blocks 30 and 31
3/4) is recorded / reproduced. The C head starts scanning the second layer from the Zone 11 and the track 47, and performs a 2.25 ECC block (ECC blocks 78 and 79,
And １ ／ of 80) are recorded / reproduced. The D head starts scanning the second layer from Zone 8 and the track 23, and performs 1.5 ECC blocks (ECC blocks 12
6 and 127) is recorded / reproduced. In other words, four rounds A to D make one round and 6.5 in 20 msec.
Record / reproduce ECC blocks.

Next, the A head is Zone 0, the track 1, the B head is Zone 3, the track 25, the C head is Zone 11, the track 46, the D head is Zone 8,
The track 22 is scanned, and one round, 6.5E in 20 msec.
Record / reproduce CC blocks.

Thereafter, similarly, the A head is Zone 0, tracks 2 to 7, the B head is Zone 3, the tracks 26 to 3
1, C head is Zone 11, track 45-40, D
The head scans Zone 8, tracks 21 to 16,
Recording 6.5 ECC blocks per 20 msec / lap
Reproduce.

Next, the A head is in Zone 1, track 8
Is scanned, and 1.25 ECC blocks (1/4 of ECC blocks 8 and 9) are recorded / reproduced. The B head scans Zone 4 and the track 32, and records / reproduces 2 ECC blocks (ECC blocks 44 and 45).
The C head scans Zone 10 and track 39, and scans 2E
Recording / reproduction of CC blocks (ECC blocks 96 and 97). The D head scans Zone 7 and track 15, and detects a 1.25 ECC block (ECC block 138,
And １ ／ of 139) are recorded / reproduced. That is, A ~
6.5EC per 20msec with 4 heads of D
Record / reproduce C block.

Similarly, heads A to D are
ne1, Zone4, Zone10, Zone7, Zo
Ne2, Zone5, Zone9, and Zone6 are simultaneously scanned, and 6.5 ECC blocks are recorded / reproduced by one of four heads A to D per 20 msec.

Finally, the A head scans Zone 2 and the track 23, and records / reproduces 1.5 ECC blocks (2/4 and 29 of the ECC blocks 28). The B head scans Zone 5 and track 47, and performs 2.25 ECC
Block (1/4, 76, 7 of ECC block 75)
7) record / reproduce. The C head scans Zone 9 and the track 24, and records / reproduces 1.75 ECC blocks (3/4, 125 of the ECC blocks 124).
D head scans Zone 6, track 0, and 1 ECC
The block (ECC block 155) is recorded / reproduced.
That is, 6.5 ECC blocks are recorded / reproduced per 20 msec in one round by four heads A to D.

As described above, by simultaneously using the four heads, a recording / reproducing speed of 6.5 ECC blocks per 20 msec, ie, 325 ECC blocks / sec, can be realized over the entire disk. This recording / reproducing speed is equivalent to twice that in the case of two heads.

FIG. 4 shows another embodiment in which a two-layer disc and four heads are used.

The head A scans the first layer from the outer circumference to the middle circumference, the head B scans the first layer from the middle circumference to the inner circumference, the head C scans the second layer from the inner circumference to the middle circumference, and the head D Scans the second layer from the middle to the outer circumference.

The track configuration of the disk is similar to that of FIG.
1, the rotational direction or spiral configuration of the disk is reversed.

The zone, track and ECC block configurations can be shown in FIGS. 29, 30 and 31 in the same manner as described above.

Here, the description of the operation is omitted.

FIG. 5 shows another embodiment in which a two-layer disc and four heads are used.

The head A scans the first layer from the inner circumference to the middle circumference, the head B scans the first layer from the outer circumference to the middle circumference, the head C scans the second layer from the inner circumference to the middle circumference, and the head D scans the first layer. Scans the second layer from the outer circumference to the middle circumference.

FIG. 22A shows a track configuration of the disk when the dual-layer disk and the four heads shown in FIG. 5 are used. In FIG. 22A, 221 is a zone number or a clock block number. 222 is a land track and 223 is a groove track. In the present embodiment, the land-groove track configuration is illustrated, but the land-groove track configuration is not necessary as in FIG. The first layer and the second layer have the same configuration, and 224 indicates the scanning start position of the first layer head A and the second layer head C, and 225 indicates the scanning start position of the first layer head B and the second layer head D. .

The configuration of zones, tracks and ECC blocks can be shown in FIGS. 30 and 31.

Here, the description of the operation is omitted.

FIG. 6 shows another embodiment in which a dual-layer disc and four heads are used.

Head A scans the first layer from the middle to the inner circumference, head B scans the first layer from the middle to the outer circumference, head C scans the second layer from the middle to the inner circumference, and head D Scans the second layer from the middle to the outer circumference.

FIG. 22B shows the track configuration of the two-layer disc and four-head disc shown in FIG.
The first layer and the second layer have the same configuration, and 226 indicates the scanning start position of the first layer head A and the second layer head C, and 227 indicates the scanning start position of the first layer head B and the second layer head D. .

The configuration of zones, tracks and ECC blocks can be shown in FIGS. 30 and 31.

Here, the description of the operation is omitted.

FIG. 22 (A) shows a first layer and FIG.
(B) is the second layer, 224 is the starting point of head A, 225
Can be set as the head B starting point, 226 as the head C starting point, and 227 as the head D starting point.

FIG. 7 shows an embodiment in which a three-layer disc and two heads are used.

The head A scans the first layer from the inner circumference to the outer circumference, jumps from the first layer to the second layer at the outermost circumference, and scans the second layer from the outer circumference to the middle circumference. The head B scans the third layer from the outer circumference to the inner circumference, jumps from the third layer to the second layer at the innermost circumference, and scans the second layer from the inner circumference to the middle circumference.

FIG. 23 shows the track configuration of the disk at this time. In FIG. 23, 231 is a zone number or a clock block number. 232 is a land track and 233 is a groove track. In this embodiment, the land / groove track configuration is exemplified.
Like FIG. 21, the land / groove track configuration is not necessary.

Reference numeral 234 denotes the first layer scanning start position, and 235 denotes the third layer scanning start position.

In the first layer, the A head scans from the innermost circumference 234 to the outermost circumference, and at the outermost circumference from the first layer to the second
Jump to layer and scan second layer from outermost to middle. In the second layer, the B head scans from the outermost circumference 235 to the innermost circumference, jumps from the third layer to the second layer at the innermost circumference, and scans the second layer from the innermost circumference to the middle circumference. .

Here, from FIG. 1 and FIG.
Although the heads seem to hit each other at the center of the disk, the two heads are actually arranged at separate positions as shown in FIG. The displacement between the two heads is 18 shown in FIG.
The angle may not be 0 degree, but may be 90 degrees or another angle.
From FIGS. 23 and 27, it can be seen that scanning does not start simultaneously at 234 and 235, but at the time of actual disk recording / reproduction, 235 is shifted with respect to 234 by an angle at which both heads are shifted. By reproducing at a shifted angle, the reproduction timing may be adjusted as a result, or the recording is started at a timing when the output of the first layer data and the third layer data is shifted by a buffer at the time of recording and coincides on the disc. In this way, the reproduction is started at the timing when the first layer and the third layer are shifted during reproduction, and the data is
This is dealt with by performing operations such as matching the final timing by the buffer process on the drive side.

Next, the data arrangement will be described.

FIG. 32 shows that the first layer has six zones (Zone 0).
~ Zone5), the second layer in 6 zones (Zone6 ~ Zo)
ne11), the third layer is made up of 6 zones (Zone 12 to Zone
e17) is shown below. 321 indicates a zone number.

FIG. 33 shows tracks and ECs in the first layer.
4 shows an example of a C block configuration. 331 is a zone number, 332 is a track number, and 333 is an ECC block number.

In Zone 0, 1.00 EC per track
Arrange C blocks, 8 ECC blocks on 8 tracks,
In Zone 1, 1.25 ECC blocks are arranged in one track, and 10 ECC blocks in Zone 8 and Zone 2
In this example, 1.50 ECC blocks are arranged in one track,
A track has 12 ECC blocks, Zone 3 has 1.75 ECC blocks on one track, 8 tracks has 14 ECC blocks, and Zone 4 has 2.75 ECC blocks on one track.
Arrange 00ECC blocks and set 16 ECC with 8 tracks
2.25 ECC per track in block and Zone5
The blocks are arranged, and there are a total of 78 ECC blocks of 18 ECC blocks in 8 tracks.

FIG. 34 shows tracks and ECs in the second layer.
4 shows an example of a C block configuration. 341 is a zone number, 342 is a track number, and 343 is an ECC block number.

In Zone 11, 2.25E per track
CC block is arranged, 18 ECC blocks are arranged in 8 tracks. In Zone 10, 2.00 ECC blocks are arranged in 1 track, 16 ECC blocks are arranged in 8 tracks, and Zon
In e9, 1.75 ECC blocks are arranged in one track, 14 ECC blocks in eight tracks, and Zone
In No. 6, 1.00 ECC blocks are arranged in one track, in 8 tracks, 8 ECC blocks are arranged, in Zone 7, 1.25 ECC blocks are arranged in one track, in 8 tracks, 10 ECC blocks are arranged, and in Zone 8, 1.50 ECC blocks are arranged in one track. , 8 tracks and 12 ECC blocks, for a total of 78 ECC blocks.

FIG. 35 shows tracks and ECs in the third layer.
4 shows an example of a C block configuration. 351 is a zone number, 352 is a track number, and 353 is an ECC block number.

In Zone 17, 2.25E per track
CC block is arranged, 18 ECC blocks are arranged in 8 tracks. In Zone 16, 2.00 ECC blocks are arranged in 1 track, and 16 ECC blocks are arranged in 8 tracks.
In e15, 1.75 ECC blocks are arranged on one track, 14 ECC blocks are arranged on 8 tracks, 1.50 ECC blocks are arranged on 1 track in Zone 14, 12 ECC blocks are arranged on 8 tracks, and 1.25 ECC block is arranged on 1 track in Zone 13. 8 tracks, 10 ECC blocks are arranged. In Zone 12, 1.00 ECC blocks are arranged in one track.
The total number of CC blocks is 78 ECC blocks.

Next, the operation will be described.

Assume that the disk rotation speed is 50 rps.

In the A head, the first layer is the innermost zone Zon.
e0, scanning starts from track 0 toward the outermost periphery.
At this time, one ECC block (ECC block 0) is recorded / reproduced in one round, that is, in 20 msec. In the B head, the third layer is the outermost zone Zone 17 and the track 47.
The scanning starts from to the innermost circumference. At this time, one lap,
That is, a 2.25 ECC block (1/4 of ECC blocks 126, 127, and 128) is recorded / reproduced in 20 msec. That is, one round, 20
3.25 ECC blocks are recorded / reproduced in msec.

Next, head A scans Zone 0 and track 1 and head B scans Zone 17 and track 46.
3.25 ECC blocks are recorded in 20 msec for one round /
Reproduce.

Thereafter, similarly, the A head is Zone 0, tracks 2 to 7, the B head is Zone 17, the tracks 45 to 45,
40 scans, 3.25 ECs per round, 20 msec
Record / reproduce C block.

Further, the A head and the B head are
1 and Zone16, Zone2 and Zone15, Zone
e3 and Zone14, Zone4 and Zone13, Zo
Ne5 and Zone 12 are simultaneously scanned, and 3.25 ECC blocks are recorded / reproduced by the A / B heads for one round and 20 msec.

Then, the A head scans Zone 5, the track 47, and records / reproduces 2.25 ECC blocks (1/4, 76, 77 of the ECC blocks 75).
The B head scans Zone 12, track 0 and 1EC
The C block (ECC block 203) is recorded / reproduced. That is, the A / B head records / reproduces 3.25 ECC blocks per 20 msec for one round.

Next, the A head jumps from the first layer to the second layer, scans the Zone 11 and the track 47, and
25 ECC blocks (ECC blocks 78, 79, 80
Recording / reproducing). The B head jumps from the third layer to the second layer, scans Zone 6, track 0, and records / reproduces one ECC block (ECC block 204). That is, one round, 20 m with both A / B heads
3.25 ECC blocks are recorded / reproduced per second.

Thereafter, similarly, the A head is Zone 11, the tracks 46 to 40, the B head is Zone 6, the track 1
Scans ~ 7, 3.25EC per round, 20msec
Record / reproduce C block.

Further, the A head and the B head are zone
7 and Zone 10, and Zone 8 and Zone 9 are simultaneously scanned, and both A / B heads record and reproduce 3.25 ECC blocks per 20 msec.

Finally, the A head scans Zone 8 and the track 23, and records / reproduces 1.5 ECC blocks (1/2 of the ECC blocks 232). The B head scans Zone 9 and the track 24, and scans 1.75E.
CC block (3/4 of ECC block 124, 1
25) is recorded / reproduced. That is, for both A / B heads, 1
3.25 ECC blocks are recorded / reproduced every 20 msec.

As described above, by using two heads simultaneously, it is possible to realize a recording / reproducing speed of 3.25 ECC blocks per 20 msec, ie, 162.5 ECC blocks / sec, over the entire disk.

FIG. 8 shows another embodiment in which a three-layer disc and two heads are used.

The head A scans the second layer from the middle to the outer circumference, jumps from the second to the first layer at the outermost circumference, and scans the first layer from the outer circumference to the inner circumference. The head B scans the second layer from the middle to the inner circumference, jumps from the second to the third layer at the innermost circumference, and scans the third layer from the inner to the outer circumference.

The track configuration of the disk is similar to that of FIG.
3, the rotation direction or spiral configuration of the disk and the starting position of the head are reversed.

Further, the configuration of the zone, the track and the ECC block can be shown in FIG. 32 and FIGS.

FIG. 9 shows another embodiment in which a three-layer disc and two heads are used.

The head A scans the first layer from the outer circumference to the inner circumference, jumps from the first layer to the second layer at the innermost circumference, and scans the second layer from the inner circumference to the middle circumference. The head B scans the third layer from the inner circumference to the outer circumference, jumps from the third layer to the second layer at the outermost circumference, and scans the second layer from the outer circumference to the middle circumference.

FIG. 10 shows another embodiment in which a three-layer disc and two heads are used.

The head A scans the second layer from the middle circumference to the inner circumference, jumps from the second layer to the first layer at the innermost circumference, and scans the first layer from the inner circumference to the outer circumference. The head B scans the second layer from the middle to the outer circumference, jumps from the second to the third layer at the outermost circumference, and scans the third layer from the outer circumference to the inner circumference.

The description of the operation will be omitted with reference to FIGS.

FIG. 11 shows an embodiment in which a three-layer disc and four heads are used.

The head A moves the first layer from the innermost circumference to the outer circumference (3 /
The head B scans the first layer around the outer periphery (3/4).
4), jump from the first layer to the second layer at the outermost circumference, and scan the second layer from the outermost circumference to the middle circumference. The head C scans the third layer from the outermost circumference to the inner circumference (1/4), and the head D moves from the inner circumference (1/4) to the innermost circumference, and at the innermost circumference from the third layer to the second layer. To scan the second layer from the innermost circumference to the middle circumference.

FIG. 24 shows the track configuration of the disk at this time. In FIG. 24, reference numeral 241 denotes a zone number or a clock block number. 242 is a land track, and 243 is a groove track. In this embodiment, the land / groove track configuration is exemplified.
Like FIG. 21, the land / groove track configuration is not necessary.

244 is a scanning start position of the first layer head A,
245 is the scanning start position of the first layer head B, 246 is the third position
The scanning start position 247 of the layer head C indicates the scanning start position of the third layer head D.

Here, from FIGS. 11 and 24, the A head,
Although the B head, the C head, and the D head appear to collide with each other at the center of the disk, actually, the two heads are arranged at separate positions as shown in FIG. The deviation between the two heads need not be 90 degrees as shown in FIG. 28, but may be 60 degrees or another angle. 24 and 28, 2
Although it does not seem to start scanning at the same time in 44 to 247, at the time of actual disk recording / reproduction, recording is performed by shifting each head by an offset angle, and reproduction is performed at an offset angle, so that the reproduction timing is consequently reduced. The recording may be started at the timing when the output of each head is shifted by the buffer at the time of recording, so that they match on the disk, and at the time of reproduction, the reproduction is started at the timing when each head is shifted, and the data is buffered. The process responds by performing operations such as matching the final timing on the drive side.

The zones, tracks and ECC block configurations can be shown in FIGS. 32 and 33 to 35 in the same manner as described above.

However, in this embodiment, Zone 0 is used in FIGS.
~ Zone3, Zone6 ~ Zone9, Zone12
~ Zone15 only, Zone4, Zone
5, Zone10, Zone11, Zone16, Zo
ne17 is invalidated. That is, the number of tracks is 32 in each layer.

Next, the operation will be described.

It is assumed that the disk rotation speed is 50 rps.

The A head starts scanning the first layer from Zone 0 and Track 0, and makes one ECC block (ECC) in one round.
Block 0) is recorded / reproduced. The B head starts scanning the first layer from Zone 3 and the track 24, and performs 1.
75 ECC blocks (ECC blocks 30 and 31
3/4) is recorded / reproduced. The C head starts scanning the third layer from Zone 15 and the track 31 and records / reproduces 1.75 ECC blocks (3/4 of the ECC blocks 160 and 161) in one round. The D head starts scanning the third layer from Zone 12 and Track 7, and makes one ECC block (ECC block 196) in one round.
Record / play back. That is, one round with four heads A to D,
Recording / reproducing 5.5 ECC blocks in 20 msec.

Next, the A head is Zone 0, the track 1, the B head is Zone 3, the track 25, the C head is Zone 15, the track 30, and the D head is Zone 1.
2. Track 6 is scanned, and one round, 5.5 in 20 msec.
Record / reproduce ECC blocks.

Thereafter, similarly, the A head is Zone 0, tracks 2 to 7, the B head is Zone 3, the tracks 26 to 3
1, C head: Zone 15, tracks 29 to 24, D
The head scans Zone 12, tracks 5 to 0,
Record 5.5 ECC blocks per 20 msec / lap /
Reproduce.

Next, the B head is moved from the outermost periphery of the first layer to the second
The D head jumps to the outermost circumference of the layer, and the D head jumps from the innermost circumference of the third layer to the innermost circumference of the second layer.

The A head scans Zone 1 and track 8, and records / reproduces 1.25 ECC blocks (1/4 of ECC blocks 8 and 9). The B head scans Zone 9 and the track 31, and scans 1.75EC.
The C block (3/4 of the ECC blocks 112 and 113) is recorded / reproduced. C head is Zone1
4. Scan the track 23 and scan the 1.5 ECC block (E
(1/2 of CC blocks 174 and 175) is recorded / reproduced. The D head scans Zone 6, track 0, and records / reproduces one ECC block (ECC block 204). That is, four heads A to D, one round, 20
Recording / reproducing 5.5 ECC blocks per msec.

Similarly, heads A to D are
ne1, Zone9, Zone14, Zone6, Zo
Ne2, Zone8, Zone13, and Zone7 are simultaneously scanned, and 5.5 heads of ECC blocks are recorded / reproduced per 20 msec by one of four heads A to D.

Finally, the A head scans Zone 2 and the track 23, and records / reproduces 1.5 ECC blocks (1/2, 29 of the ECC blocks 28). The B head scans the Zone 8 and the track 16 to obtain 1.5 ECC blocks (1/2 of the ECC blocks 222 and 223).
Record / play back. The C head scans Zone 13 and track 8, and records / reproduces 1.25 ECC blocks (1/4, 195 of ECC blocks 194). The D head scans Zone 7 and track 15, and 1.25E
CC block (1/4 of ECC block 220, 2
21) is recorded / reproduced. That is, with four heads A to D,
5.5 ECC blocks are recorded / reproduced per 20 msec in one round.

As described above, by simultaneously using the four heads, a recording / reproducing speed of 5.5 ECC blocks per 20 msec, ie, 275 ECC blocks / sec, can be realized over the entire disk. This recording / reproducing speed is equivalent to twice that in the case of two heads.

FIG. 12 shows another embodiment in which a three-layer disc and four heads are used.

The head A scans the second layer from the middle to the outermost circumference, jumps from the second to the first at the outermost circumference, and moves the first layer from the outermost to the outer circumference (3/4). Scan. The head B scans the first layer from the outer circumference (3/4) to the innermost circumference. The head C scans the second layer from the middle to the innermost circumference, jumps from the second to the third layer at the innermost circumference, and moves the third layer from the innermost to the inner circumference (1/4). Scan toward The head D scans the third layer from the inner circumference (1/4) to the outermost circumference.

The track configuration of the disk is similar to that of FIG.
4, the rotation direction of the disk, the spiral configuration, and the start position of the head are reversed.

Further, the configuration of the zone, the track and the ECC block can be shown in FIG. 32 and FIGS.

FIG. 13 shows another embodiment in which a three-layer disc and four heads are used.

The head A moves the first layer from the outermost circumference to the inner circumference (1/1).
The head B scans the first layer on the inner periphery (1/1) of the first layer.
4), jump from the first layer to the second layer at the innermost circumference, and scan the second layer from the innermost circumference to the middle circumference. The head C scans the third layer from the innermost circumference to the outer circumference (3/4), and the head D jumps from the outer circumference (3/4) to the outermost circumference, and jumps from the third layer to the second layer at the outermost circumference. , The second layer is scanned from the outermost circumference to the middle circumference.

FIG. 14 shows another embodiment in which a three-layer disc and four heads are used.

The head A scans the second layer from the middle circumference to the innermost circumference, jumps from the second layer to the first layer at the innermost circumference, and moves the first layer from the innermost circumference to the inner circumference (1/1). Scan toward 4). The head B scans the first layer from the inner circumference (1/4) to the outermost circumference. The head C scans the second layer from the middle to the outermost circumference, jumps from the second to the third layer at the outermost circumference, and scans the third layer from the outermost to the outer circumference (3/4). . The head D scans the third layer from the outer circumference (3/4) to the innermost circumference.

The description of the operation of FIGS. 12 to 14 is omitted.

FIG. 15 shows an embodiment in which a four-layer disc and two heads are used.

The head A scans the first layer from the inner periphery to the outer periphery, jumps from the first layer to the second layer at the outermost periphery, and scans the second layer from the outer periphery to the inner periphery. The head B scans the fourth layer from the outer periphery to the inner periphery, jumps from the fourth layer to the third layer at the innermost periphery, and scans the third layer from the inner periphery to the outer periphery.

FIG. 25 shows the track configuration of the disk at this time. In FIG. 25, reference numeral 251 denotes a zone number or a clock block number. 252 is a land track and 253 is a groove track. In this embodiment, the land / groove track configuration is exemplified.
Like FIG. 21, the land / groove track configuration is not necessary.

Reference numeral 254 denotes a first layer scanning start position, and 255 denotes a fourth layer scanning start position.

In the first layer, the A head scans from the innermost circumference 254 to the outermost circumference, and at the outermost circumference, scans the first layer to the second
Jump to layer and scan second layer from outermost to innermost. In the fourth layer, the B head scans from the outermost circumference 255 to the innermost circumference, jumps from the fourth layer to the third layer at the innermost circumference, and scans the third layer from the innermost circumference to the outermost circumference. .

Description of the operation will be omitted with reference to FIGS.

FIG. 16 shows another embodiment in which a four-layer disc and two heads are used.

The head A scans the first layer from the outer periphery to the inner periphery, jumps from the first layer to the second layer at the innermost periphery, and scans the second layer from the inner periphery to the outer periphery. The head B scans the fourth layer from the inner periphery to the outer periphery, jumps from the fourth layer to the third layer at the outermost periphery, and scans the third layer from the outer periphery to the inner periphery.

The track configuration of the disk can be shown in FIG. 25, but the rotational direction of the disk, the spiral configuration, and the start position of the head are reversed.

Referring to FIG. 16, description of the operation will be omitted.

FIG. 17 shows an embodiment in which a four-layer disc and four heads are used.

The head A scans the first layer from the inner periphery to the outer periphery, and the head B scans the second layer from the outer periphery to the inner periphery.

A head C scans the fourth layer from the outer periphery to the inner periphery, and a head D scans the third layer from the inner periphery to the outer periphery.

FIG. 26 shows the track configuration of the disk at this time. In FIG. 26, reference numeral 261 denotes a zone number or a clock block number. 262 is a land track and 263 is a groove track. In this embodiment, the land / groove track configuration is exemplified.
Like FIG. 21, the land / groove track configuration is not necessary.

Reference numeral 264 denotes a first layer scan start position, 265 denotes a second layer scan start position, 266 denotes a fourth layer scan start position, and 267 denotes a third layer scan start position.

In the first layer, the A head scans from the innermost circumference 264 to the outermost circumference, and in the second layer, the B head scans the outermost circumference 2
In the fourth layer, the C head scans from the outermost periphery 266 to the innermost periphery, and in the third layer, the D head scans from the innermost periphery 267 to the outermost periphery. .

The description of the operation will be omitted with reference to FIGS.

FIG. 18 shows another embodiment in which a four-layer disc and four heads are used.

The head A scans the first layer from the outer periphery to the inner periphery, and the head B scans the second layer from the inner periphery to the outer periphery.

The head C scans the fourth layer from the inner circumference to the outer circumference, and the head D scans the third layer from the outer circumference to the inner circumference.

The track configuration of the disk can be shown in FIG. 26, but the rotation direction or spiral configuration of the disk and the start position of the head are reversed.

FIG. 19 shows another embodiment in which a four-layer disc and four heads are used.

The head A scans the first layer from the inner periphery to the outer periphery, and the head B scans the second layer from the outer periphery to the inner periphery.

The head C scans the fourth layer from the inner circumference to the outer circumference, and the head D scans the third layer from the outer circumference to the inner circumference.

FIG. 20 shows another embodiment in which a four-layer disc and four heads are used.

The head A scans the first layer from the outer periphery to the inner periphery, and the head B scans the second layer from the inner periphery to the outer periphery.

The head C scans the fourth layer from the outer circumference to the inner circumference, and the head D scans the third layer from the inner circumference to the outer circumference.

Description of the operation will be omitted with reference to FIGS.

As described above, with respect to the two-head type, the embodiment shows two, three, and four layers. However, the present invention can be applied to one, five or more layers. In a K-layer (K ≧ 1) disk including one or five or more layers: When K is an even number, A and B heads scan K / 2 layers simultaneously, and A head When the head B scans from the outer circumference to the inner circumference when scanning from the circumference to the outer circumference, and when the A head scans from the outer circumference to the inner circumference, the B head scans from the inner circumference to the inner circumference. The disk spiral is configured to scan from to the outer periphery.

When K is an odd number, each of the heads A and B scans (K-1) / 2 layers simultaneously, and then scans one layer simultaneously at an arbitrary time. When the head scans from the inner circumference to the outer circumference, the B head scans from the outer circumference to the inner circumference. When the A head scans from the outer circumference to the inner circumference, the B head scans. The disk spiral is configured to scan from the inner circumference to the outer circumference. In this case, a single layer scanned by both heads at the same time has a structure as shown in FIGS. 22 (A) and 22 (B) in which the spiral hits the middle circumference.

Although only the two-head to four-head type has been described, an even-numbered type having six or more heads is also possible. K layer, L head including 6 or more heads (L
Can be configured as follows.

When K is divisible by L, all the heads scan K / L layers simultaneously, and when L / 2 heads scan from the inner circumference to the outer circumference, the remaining L / 2 heads scan from the outer circumference to the inner circumference, and when L / 2 heads scan from the outer circumference to the inner circumference, the remaining L / 2 heads scan the inner circumference. The disk spiral is configured to scan from to the outer periphery.

When K is not divisible by L, all the heads scan Int (K / L) layers (where Int is the largest integer not exceeding the value) at the same time, and simultaneously scan at any time. (K / L-Int (K / L)) layers are scanned, and when L / 2 heads are scanning from the inner circumference to the outer circumference, the remaining L / 2 heads are scanning the outer circumference. From the outer circumference to the inner circumference, and when L / 2 heads scan from the outer circumference to the inner circumference, the remaining L / 2 heads scan from the inner circumference to the outer circumference. The disk spiral is configured as follows.

By the way, in an M-layer disc (M> K), (M−K) layers can be scanned separately from the K layer.

For example, in a five-layer disc, K = 4,
An example in which L = 2 and M = 5 is shown.

As for the four-layer (K = 4) portion in the five-layer (M = 5), two heads (L =
Scan simultaneously at 2). The remaining one layer is a spiral that scans from the normal inner circumference to the outer circumference. This portion is scanned by the A head from the inner circumference 1/3 to the outer circumference 2/3, and at the same time, the B head is scanned from the outer circumference 2/3 to the outermost circumference. This makes it impossible to use from the innermost circumference to the inner circumference 1/3, but despite the five layers (odd-numbered layers), the spirals of all layers are one from the inner circumference to the outer circumference or from the outer circumference to the inner circumference. And since the total scanning linear velocity of the two heads is the same as that of the four-layer (K = 4) scanning portion, the four-layer (K = 4)
4) It is possible to guarantee the minimum recording / reproduction bit rate of the part.

As described above, several embodiments have been described.
The layer number and head number may be exchanged.

Also, an example in which the number of bits per track changes for each zone has been described. By setting 1 zone = 1 track, the number of bits per track changes for each track. It is also possible.

Next, an example of a method of allocating composite data composed of video data, audio data, computer data, user data, and the like to a plurality of heads will be described.

In the data division into a plurality of heads, a data amount almost proportional to the disk diameter at the position where each head exists is distributed.

That is, for example, when the data rate distributed to the A head and the B head is 30 Mbps, and the ratio of the diameter of the A head to the B head is 2: 1, the A head has about 20 Mbps.
Approximately 10 Mbps is allocated to the s and B heads. (Hereafter,
"About" display is omitted. ) Allocation method is as method 1.
There is a method of allocating all data 2: 1. Method 2
A method in which the distribution ratio is changed only for video data having a large data amount, audio data, computer data, user data, etc. is always distributed at a ratio of 1: 1, and as a result, all data is distributed at a ratio of 2: 1 in proportion to the diameter. There is.

For example, if the composite data rate is 30 Mbps,
22.5Mbps video data, 1.5M audio data
bps, computer data is 3 Mbps, and user data is 3 Mbps.

In the method 1, the video data is transferred to the head A by 15
20 Mbps, 1 Mbps for voice data, 2 Mbps for computer data, and 2 Mbps for user data
7.5 Mbps, audio data 0.5 Mbps, computer data 1 Mbps
ps and user data are distributed at 10 Mbps of 1 Mbps.

In the method 2, the video data is stored in the head A by 1
6.25 Mbps, audio data 0.75 Mbps, computer data 1.5 Mbps, user data 1.5 Mbps, 20 Mbps, head B video data 6.25 Mbps, audio data 0.75 Mbps,
The computer data is allocated at 1.5 Mbps, and the user data is allocated at 1.5 Mbps at 10 Mbps. According to the method 2, only the video data needs to change the distribution ratio depending on the diameter, and the distribution control becomes easy.

FIG. 36 shows a recording circuit in the two heads of the present invention.

The recording data 361 is input to the data input circuit 362. Next, the data is controlled by the recording control circuit 363 and input to the buffer 364. The print data processing circuit 365 is controlled by 363 and takes a predetermined amount of data from 364 that is approximately proportional to the diameter of the print position of each head.
Send to 66. Then, recording is simultaneously performed from the two heads 366 to the 367 disks at different recording bit rates.

The 368 disk control circuit has 36
3 for controlling the disk rotation.

FIG. 37 shows a reproducing circuit in the two heads of the present invention.

The disk control circuit 378 is controlled by the reproduction control circuit 373, and performs disk rotation control.

With respect to the disk 377, reproduction is performed simultaneously from two heads 376 at different reproduction bit rates. Each head 376 is controlled by 373 and sends respective data to a reproduction data processing circuit 375. 375 is controlled by 373, and inputs a data amount approximately proportional to the diameter of the reproduction position in each head to the buffer of 374. 374 is controlled by 373,
The unified data is sent to the data output circuit 372. The reproduction data is output from 372 through 371.

[0175]

According to the present invention, the disk medium has a K layer (K ≧ 1),
When the number of heads of the disk device is L (L is an even number of 2 or more), the disk rotation speed is fixed, and when K is divisible by L, all the heads scan K / L layers simultaneously. When L / 2 heads scan from the inner circumference to the outer circumference, the remaining L / 2 heads scan from the outer circumference to the inner circumference, and L / 2 heads scan the outer circumference. While scanning inward from, the remaining L /
The disk spiral is configured so that the two heads scan from the inner circumference to the outer circumference. When K is not divisible by L, Int (K / L) pieces (where I
nt is the largest integer that does not exceed that value), and at the same time at any time (K / L-Int (K /
L)) layers are scanned, and when L / 2 heads scan from the inner periphery to the outer periphery, the remaining L / 2 heads are scanned.
So that the heads scan from the outer circumference to the inner circumference,
Further, when the L / 2 heads are scanning from the outer circumference to the inner circumference, the disk spiral is configured so that the remaining L / 2 heads scan from the inner circumference to the outer circumference,
The configuration in which the ratio of the data bit rate to be recorded or reproduced from each head approximately matches the ratio of the disk diameter at the position of each head has the effect that the recording or reproduction speed can be kept constant over the entire disk.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention showing a head scanning method in the case of a two-layer disk two-head configuration.

FIG. 2 is another embodiment of the present invention showing how to scan the head in the case of a two-layer disk with two heads.

FIG. 3 is an embodiment of the present invention showing a head scanning method in the case of a two-layer disk with four heads.

FIG. 4 is another embodiment of the present invention showing a head scanning method in the case of a two-layer disk with four heads.

FIG. 5 is still another embodiment of the present invention showing a head scanning method in the case of a two-layer disk with four heads.

FIG. 6 is still another embodiment of the present invention showing a head scanning method in the case of a two-layer disk with four heads.

FIG. 7 is an embodiment of the present invention showing a head scanning method in the case of a three-layer disk two-head configuration.

FIG. 8 is another embodiment of the present invention showing a head scanning method in the case of a three-layer disk two-head configuration.

FIG. 9 is still another embodiment of the present invention showing a head scanning method in the case of a three-layer disk two-head configuration.

FIG. 10 is still another embodiment of the present invention showing a head scanning method in a three-layer disk two-head configuration.

FIG. 11 is an embodiment of the present invention showing how to scan the head in the case of a three-layer disk with four heads.

FIG. 12 is another embodiment of the present invention showing a head scanning method in the case of a three-layer disk and four heads configuration.

FIG. 13 is still another embodiment of the present invention showing a head scanning method in the case of a three-layer disk with four heads.

FIG. 14 shows still another embodiment of the present invention, showing a head scanning method in the case of a three-layer disk with four heads.

FIG. 15 is an embodiment of the present invention showing how to scan the head in the case of a four-layer disc with two heads.

FIG. 16 is another embodiment of the present invention showing how to scan a head in the case of a four-layer disc with two heads.

FIG. 17 is an embodiment of the present invention showing how to scan the head in the case of a four-layer disk with four heads.

FIG. 18 is another embodiment of the present invention showing a head scanning method in the case of a four-layer disk with four heads.

FIG. 19 shows still another embodiment of the present invention, showing a head scanning method in the case of a four-layer disk with four heads.

FIG. 20 is still another embodiment of the present invention showing a head scanning method in the case of a four-layer disk with four heads.

FIG. 21 shows a track configuration of a dual-layer disc according to an embodiment of the present invention.

FIG. 22 is a track configuration of a dual-layer disc according to another embodiment of the present invention.

FIG. 23 is a track configuration of a three-layer disc according to an embodiment of the present invention.

FIG. 24 is a track configuration of a three-layer disc according to another embodiment of the present invention.

FIG. 25 is a track configuration of a four-layer disc according to an embodiment of the present invention.

FIG. 26 shows a four-layer disc track configuration according to another embodiment of the present invention.

FIG. 27 shows a head arrangement at the time of two heads.

FIG. 28 shows a head arrangement at the time of four heads.

FIG. 29 shows a two-layer disc zone configuration.

FIG. 30 shows a dual-layer disc zone according to an embodiment of the present invention;
2 shows a track and an ECC block configuration (first layer).

FIG. 31 shows a dual-layer disc zone according to an embodiment of the present invention;
3 shows a track and an ECC block configuration (second layer).

FIG. 32 illustrates a three-layer disc zone configuration according to an embodiment of the present invention.

FIG. 33 shows a three-layer disc zone according to an embodiment of the present invention;
2 shows a track and an ECC block configuration (first layer).

FIG. 34 shows a three-layer disc zone according to an embodiment of the present invention;
3 shows a track and an ECC block configuration (second layer).

FIG. 35 shows a three-layer disc zone according to an embodiment of the present invention;
4 shows a track and an ECC block configuration (third layer).

FIG. 36 is a recording circuit in two heads according to an embodiment of the present invention.

FIG. 37 is a reproduction circuit in two heads according to an embodiment of the present invention.

FIG. 38 is a diagram showing an example of land / groove scanning using a conventional disk medium.

[Explanation of symbols]

 211 Zone (Clock Block) 212 Land Track 213 Groove Track 214 A Head Start Point 215 B Head Start Point 221 Zone (Clock Block) 222 Land Track 223 Groove Track 224 A Head Start Point 225 B Head Start Point 226 A Head Start Point 227 B head start point 231 zone (clock block) 232 land track 233 groove track 234 A head start point 235 B head start point, 241 zone (clock block) 242 land track 243 groove track 244 A head start point 245 B head start point 246 C head start point 247 D head start point 251 Zone (clock block) 252 Land track 253 Groove track 254 A head start Point 255 B head start point 261 zone (clock block) 262 land track 263 groove track 264 A head start point 265 B head start point 266 C head start point 267 D head start point 291 zone (clock block) 301 zone (clock block) 302 track 303 ECC block 311 zone (clock block) 312 track 313 ECC block 321 zone (clock block) 331 zone (clock block) 332 track 333 ECC block 341 zone (clock block) 342 track 343 ECC block 351 zone (clock block) 352 track 353 ECC block 361 recording data 362 data input circuit 363 recording control circuit 36 Buffer 365 recording data processing circuit 366 head 367 disk 368 disk controller 371 reproduction data 372 data output circuit 373 reproducing control circuit 374 the buffer 375 reproduced data processing circuit 376 head 377 disk 378 hard disk controller

Claims (24)

[Claims] 1. The spiral direction of a track of a first layer and the spiral direction of a track of a second layer are opposite to each other.
A disk device using a layered disk medium, wherein a first head and a second head are arranged on a first layer and a second layer, respectively, of the disk medium, and the number of rotations of the disk is constant. The first head scans from the inner circumference to the outer circumference, and simultaneously scans the second head from the outer circumference to the inner circumference in the second layer to record or reproduce data from the first head. A disk device, wherein a ratio of a data bit rate to be recorded or reproduced from a second head substantially matches a ratio of a disk diameter at a position of the head. 2. The spiral direction of a track on a first layer and the spiral direction of a track on a second layer are opposite to each other.
A disk device using a layered disk medium, wherein first and second heads and third and fourth heads are arranged on a first layer and a second layer of the disk medium, respectively, and the disk rotation speed is fixed. , The first in the first layer
Scans the inner head from the inner or middle circumference to the middle or inner circumference, and simultaneously scans the second head in the first layer from the middle or outer circumference to the outer circumference or middle circumference, and simultaneously scans the second head in the first layer. Scanning the third head in the layer from the outer circumference or the middle to the middle or outer circumference, and simultaneously scanning the fourth head in the second layer from the middle or the inner circumference to the inner or middle circumference; Here, the number of heads scanning toward the outer circumference and the number of heads scanning toward the inner circumference are each two, and the ratio of the data bit rate to be recorded or reproduced from each head is determined by the ratio of the disk diameter at the position of each head. A disk device characterized by being approximately matched to a ratio. 3. A two-layer data recording disk, comprising:
The spiral direction of the track from the inner circumference to the middle circumference of the layer and the spiral direction of the track from the middle circumference to the outer circumference are opposite directions, and / or the spiral direction of the track from the inner circumference to the middle circumference of the second layer. A disk medium, wherein a spiral direction of a track from a middle circumference to an outer circumference is reversed. 4. A disk drive using the disk medium according to claim 3, wherein four heads are arranged on the disk, and the number of heads scanning toward the outer circumference and the head scanning toward the inner circumference. A disk device, wherein the number is two, and the ratio of the data bit rate for recording or reproducing from each head is approximately equal to the ratio of the disk diameter at the position of each head. 5. A three-layer disc for data recording, comprising:
And the spiral direction of the track from the inner circumference to the middle circumference of the second layer coincides with the
The spiral direction of the track from the middle circumference to the outer circumference of the third layer matches the spiral direction of the track of the third layer,
A disk in which the spiral direction from the inner circumference to the middle circumference of the second layer and the spiral direction from the middle circumference to the outer circumference of the second layer and the entire third layer are opposite. Medium. 6. A disk drive using the disk medium according to claim 5, wherein two heads are arranged, the disk rotation speed is fixed, and the first head is moved from the inner circumference to the outer circumference in the first layer. Scanning at the same time, the second head scans from the outer circumference to the inner circumference in the third layer, and the first head moves to the outermost circumference or the second head moves to the innermost circumference at the same time. The first head and the second head simultaneously jump to the second layer substantially at the same position, and thereafter, the first head scans from the outermost circumference to the middle circumference, and the second head moves to the innermost circumference. From the first head to the middle circumference, or both the first head and the second head scan in the opposite direction, and the data bit rate for recording or reproduction from the first head and the recording from the second head. Or the playback data bit rate Disk apparatus characterized by the rate, is substantially aligned with the ratio of the disc diameter of the position of the head. 7. A disk drive using the disk medium according to claim 5, wherein four heads are arranged, the disk rotation speed is kept constant, and the first head is moved from the innermost circumference to the outer circumference in the first layer. 3/4, and simultaneously scans the second head in the first layer from the outer circumference 3/4 to the outermost circumference, and simultaneously moves the third head in the third layer from the outermost circumference to the inner circumference 1/4. / 4, and simultaneously scans the fourth head in the third layer from the inner circumference 1/4 to the innermost circumference, so that the second head reaches the outermost circumference or the fourth head As soon as the innermost circumference is reached, the second and fourth heads simultaneously jump to the second layer substantially at the same position, and thereafter the first and third heads scan as they are, Head scans from the outermost circumference to the middle circumference, and the fourth head scans Scanning toward the middle circumference from the inner circumference,
Or, each head scans in the opposite direction to the above,
A disk device, wherein a ratio of a data bit rate to be recorded or reproduced from each head is approximately equal to a ratio of a disk diameter at a position of the head. 8. A four-layer data recording disk, comprising:
The spiral direction of the track of the third layer and the spiral direction of the track of the third layer are matched, the spiral direction of the track of the second layer is matched with the spiral direction of the track of the fourth layer, and the first layer and the spiral direction of the track are matched. A disk medium, wherein a spiral direction of a track of a third layer and a spiral direction of a track of a second layer and a track of a fourth layer are opposite to each other. 9. A disk drive using the disk medium according to claim 8, wherein two heads are arranged, the disk rotation speed is fixed, and the first head is moved from the inner circumference to the outer circumference in the first layer. And the second head is simultaneously scanned from the outer periphery to the inner periphery in the fourth layer, and the first head is moved to the outermost periphery or the second head is moved to the innermost periphery at the same time. The first head and the second head simultaneously jump to the second layer and the third layer respectively at the same position, and then the first head scans from the outermost circumference to the inner circumference, and Head scans from the innermost circumference to the outer circumference, and determines the ratio of the data bit rate for recording or reproduction from the first head to the data bit rate for recording or reproduction from the second head by the disk diameter at the position of the head. Approximate to ratio Disk device for causing Itasa. 10. A disk device using the disk medium according to claim 8, wherein four heads are arranged, the disk rotation speed is kept constant, and the first head is moved from the inner circumference or the outer circumference in the first layer. Scans toward the outer circumference or inner circumference, simultaneously scans the second head in the second layer from the outer circumference or the inner circumference toward the inner circumference or the outer circumference, and simultaneously scans the third head in the fourth layer toward the outer or inner circumference. The number of heads that scans from the circumference to the inner circumference or the outer circumference, and simultaneously scans the fourth head in the third layer from the inner circumference or the outer circumference to the outer circumference or the inner circumference, where the number of heads that scans toward the outer circumference The number of heads scanning toward the inner peripheral side is set to two, and the ratio of the data bit rate to be recorded or reproduced from each head approximately matches the ratio of the disk diameter at the position of each head. Disk device. 11. In a K-layer (K ≧ 1) disk for data recording, when K is an even number, the spiral direction of the tracks on the odd-numbered layers is matched, and the K-layers on the even-numbered layers are aligned. The spiral direction of the tracks is matched, and the spiral direction of the tracks between the odd-numbered layers and the even-numbered layers is reversed. When K is an odd number, the tracks on the odd-numbered layers are excluded except for the Kth layer. The spiral direction of the tracks on the even-numbered layers is matched, the spiral direction of the tracks between the odd-numbered layers and the even-numbered layers is reversed, and the A disk medium characterized in that a spiral direction of a track from a circumference to a middle circumference and a spiral direction of a track from a middle circumference to an outer circumference are reversed. 12. A disk drive using the disk medium according to claim 11, wherein two heads are arranged, the disk rotation speed is fixed, and when K is an even number, an odd-numbered layer is formed by the first head. And the second head scans the even-numbered layers simultaneously, and when the first head scans from the inner or outer circumference to the outer or inner circumference, the second head moves from the outer or inner circumference. Scanning toward the inner circumference or outer circumference. When K is an odd number, except for the K-th layer, the first head simultaneously scans the odd-numbered layer and the second head simultaneously scans the even-numbered layer. The K-layer is simultaneously scanned by both heads. When the first head is scanning from the inner circumference or outer circumference to the outer circumference or inner circumference, the second head is scanned from the outer circumference or the inner circumference to the inner circumference or Scan towards the outer circumference,
A disk device, wherein a ratio of a data bit rate to be recorded or reproduced from each head is approximately equal to a ratio of a disk diameter at a position of each head. 13. A disk drive using the disk medium according to claim 11, wherein L heads (L is an even number of 2 or more) are arranged, the disk rotation speed is fixed, and K is divisible by L. All the heads scan K / L layers at the same time, and when L / 2 heads scan from the inner circumference to the outer circumference, the remaining L / 2 heads move from the outer circumference to the inner circumference. When K is not divisible by L, Int (K / L) is simultaneously scanned in all heads (I
nt is the largest integer that does not exceed that value), and at the same time at any time (K / L-Int (K /
L)) layers are scanned, and when L / 2 heads scan from the inner circumference to the outer circumference, the remaining L / 2 heads are scanned.
Heads scan from the outer circumference to the inner circumference, and the ratio of the data bit rate recorded or reproduced from each head is
A disk drive wherein the head position is substantially matched to the ratio of the disk diameter at each head position. 14. The disk medium is an M-layer disk (M> K).
14. The disk device according to claim 12, wherein (MK) layers are separately scanned. 15. The number of bits per track is varied for each track so that the ratio of the data bit rate recorded or reproduced from each head substantially matches the ratio of the disk diameter at the position of each head. The disk medium according to any one of claims 3, 5, 8, and 11, wherein: 16. The number of bits per track for each track so that the ratio of the data bit rate recorded or reproduced from each head of the disk medium substantially matches the ratio of the disk diameter at the position of each head. The method according to claim 1, wherein the variable is made.
14. The disk device according to any one of 10, 12, and 13. 17. A zone is constituted by a plurality of tracks, and a ratio of a data bit rate to be recorded or reproduced from each head is approximately equal to a ratio of a disk diameter at a position of each head. 12. The method according to claim 3, wherein the number of bits is variable, and the number of bits per track is constant in the zone.
The disk medium according to any one of the preceding claims. 18. A disk medium, wherein a zone is formed by a plurality of tracks, and a ratio of a data bit rate to be recorded or reproduced from each head substantially matches a ratio of a disk diameter at a position of each head. 14. The method according to claim 1, wherein the number of bits per track is varied in each zone, and the number of bits per track is constant in each zone. The disk device according to claim 1. 19. When allocating composite data composed of a plurality of types of data to a plurality of heads, the data is set so that each type of data substantially matches the ratio of the disk diameter at the position where each head exists. The disk medium according to any one of claims 3, 5, 8, 11, and 17, wherein the amount is distributed. 20. When allocating composite data composed of a plurality of types of data to a plurality of heads, the data of each type is adjusted so that the ratio substantially matches the ratio of the disk diameter at the position where each head exists. 2. The method according to claim 1, wherein the amount is distributed.
19. The disk device according to any one of 2, 13, and 18. 21. When allocating composite data composed of a plurality of types of data to a plurality of heads, the allocation ratio is changed only for a specific type of data, and the other types of data are equally distributed. The disk according to any one of claims 3, 5, 8, 11, and 17, wherein a data amount is allocated so that all data substantially matches a ratio of a disk diameter at a position where each head exists. Medium. 22. When allocating composite data composed of a plurality of types of data to a plurality of heads, only a specific type of data is changed in the allocation ratio, and the other types of data are equally distributed. As a result, The data amount is distributed so that all data substantially matches the ratio of the disk diameter at the position where each head exists.
19. The disk device according to any one of 9, 10, 12, 13 and 18. 23. The disk medium according to claim 21, wherein a plurality of types of data are video data, audio data, computer data, user data, object data, and the like, and a specific type of data is video data. 24. The disk device according to claim 22, wherein a plurality of types of data are video data, audio data, computer data, user data, object data, and the like, and a specific type of data is video data.