JPH0785642A - Disk-shaped recording medium - Google Patents

Abstract

PURPOSE:To provide a disk shaped recording medium which does not impair the stability of tracking characteristics, has a large recording capacity and facilitate address management in drive. CONSTITUTION:An annular recording region 1 is divided into plural zones 2a to 2j varying in radial regions and the circumferential direction of the spiral or concentrical physical tracks formed in the respective zones is divided to plural sectors in such a manner that the number of the sector divisions is larger the nearer the outer zones. The addresses to be recorded in each of the respective sectors are composed of the sector addresses repeated by each of the specified number of the sectors and the track addresses updated by each one turning around of the sector addresses regardless of the number of the sector divisions of the physical tracks. The boundaries of the respective zones are aligned to the reference position A-A set in the same radial direction of the recording region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called ZCAV (Zoned
The present invention relates to a disc-shaped recording medium of Constant Angular Velocity) system, and more specifically to a track and sector format.

[0002]

2. Description of the Related Art Conventionally, a ring-shaped recording area is divided into a plurality of zones having different radius areas, and the circumference of a track (physical track) formed in a spiral or concentric shape with physical means in each zone. There is known a ZCAV disc-shaped recording medium that is divided into a plurality of sectors such that the number of sector divisions increases toward the outer side of the direction and the sector lengths in each zone are substantially equal. Since the disc-shaped recording medium of this method has a higher recording density toward the outer peripheral zone, when it is rotationally driven at the same angular velocity, the CAV (Constant Angular Velocit
It is possible to increase the recording capacity as compared with a disk-shaped recording medium of y: constant angular velocity) method.

By the way, the disk-shaped recording medium is pre-formatted with an address peculiar to each sector of each track, and is constructed so that information can be recorded, reproduced, and erased for each sector. In the conventional disk-shaped recording medium of this type, a track address is assigned for each circumference of a physical track, and each track is sequentially included from a specific sector positioned with reference to the same radial direction of the recording area. The sector address of the sector is assigned.

[0004]

In the disk-shaped recording medium of the ZCAV system, the maximum number of sector addresses changes for each zone because the number of sector divisions differs for each zone. Therefore, in the disk format in which the track address is assigned to each physical track and the sector address is assigned to each sector in each physical track as described above, for example, a replacement sector is always provided in the last sector in one track. When adopting such a format, the drive side must manage all track addresses and the sector addresses of the replacement sectors for each track, and the amount of information becomes enormous and the address management in the drive becomes complicated. .

The problem is that the addresses recorded for each sector are a sector address that is repeated for a fixed number of sectors regardless of the number of sector divisions, and a track address that is updated each time the sector address completes a cycle. It can be avoided by configuring from. However, if the disk format is simply configured in this way, the boundary of each zone is dispersed in various directions in the circumferential direction on the medium,
The address management in the drive becomes complicated, and the effect of the disk format as described above is diminished. In an optical information recording medium, for example, one of two adjacent zones is a read-only zone in which information is recorded in advance in the form of pre-pits, and the other is recorded in which information is not recorded in the form of pre-pits. If possible zones are used, a situation will occur in which areas with different servo characteristics coexist in one physical track, so unless difficult control such as changing the tracking gain between one physical track is performed. , Stable tracking cannot be secured.

The present invention has been made to solve the above problems, and an object thereof is to provide a disk-shaped recording medium having a large recording capacity and easy address management in a drive without impairing the stability of tracking characteristics. To provide.

[0007]

In order to achieve the above-mentioned object, the present invention divides a ring-shaped recording area into a plurality of zones having different radius areas, and forms a spiral or concentric circle in each zone. In a disk-shaped recording medium formed by dividing the physical track into a plurality of sectors such that the outer zones in the circumferential direction of the physical track are larger, the addresses recorded for each sector are related to the sector division number. And a track position that is updated every time the sector address makes a round, and the boundary of each zone is a reference position set in the same radial direction of the recording area. It was arranged according to.

It is not necessary to divide the zones into areas having different purposes of use, such as a user area, a management area, and a medium test area. One zone is further divided into a plurality of areas, and each area has a user area. It is also possible to assign a management area, a media test area, and the like. In this case, the boundaries of the divided areas in the zone are aligned with the reference position. The user area can be composed of a RAM area in which information can be recorded,
It is also possible to have a ROM area capable of only reproducing information. Further, these RAM area and ROM area can be mixed. R in one user area
When the AM area and the ROM area are mixed, the boundary portion of each area is aligned with the reference position.

[0009]

When the address recorded for each sector is composed of a sector address repeated for every fixed number of sectors regardless of the number of sector divisions of the physical track, and a track address updated every time the sector address makes a round. , The number of sectors included in all tracks (logical tracks) logically defined as one track is the same. Therefore, when adopting a format in which a replacement sector is always provided in the last sector in each logical track, only one type of sector address of the replacement sector needs to be managed on the drive side, and the amount of information can be greatly reduced. Address management can be made much easier.

Further, according to this method, since the header exists at the reference position in the radial direction in every track, even if the gate signal of the reference signal is made to access from one zone to another zone, First, the address information can be quickly read by detecting the header by relying on the gate signal at the reference position.

Further, if the boundaries of the zones are made to coincide with each other in the same radial direction of the recording area, the address management of the zone boundaries in the drive becomes easy, even if one track is always jumped at the same position (reference position). , One of two adjacent zones is a read-only zone in which information is recorded in the form of pre-pits in advance, and the other is a recordable zone in which information is not recorded in the form of pre-pits. It is possible to avoid mixing of areas having different servo characteristics in the physical tracks around the circumference. Therefore, it is possible to avoid difficult control such as changing the tracking gain between the physical tracks of one round, and secure stable tracking. When one zone is divided into a user area, a management area, and a media test area for use, and one zone is R
Even when the area is divided into the AM area and the ROM area, by aligning the boundary portions of the respective areas in the same radial direction of the recording area, the address management of the area boundary portion in the drive is facilitated for the same reason as described above. It is possible to realize easy and stable tracking control.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the disk format according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a disc-shaped recording medium according to this example, FIG. 2 is a table diagram showing an example of a track format of the disc-shaped recording medium shown in FIG. 1, and FIG.
Is an enlarged view of the main part of the disk-shaped recording medium at the zone boundary,
FIG. 4 is an enlarged view of a main part of the disc-shaped recording medium at the area boundary portion.

As shown in FIGS. 1 and 2, this embodiment is applied to a disk-shaped recording medium having a diameter of 5 inches,
The ring-shaped recording area 1 is divided into 10 zones 2a, 2b, 2c, ..., 2j having different radius areas.
The innermost zone 2a is divided into three areas having different radius areas, and the innermost management data area 3a, the innermost test area 3b, and the first user area 3c are sequentially allocated from the innermost side. ing. The second zone 9b to the ninth zone 2i are assigned the second user area to the ninth user area, respectively. Furthermore, the outermost zone 2
j is divided into three areas having different radius areas, and a tenth user area 3d, an outer circumference management data area 3e, and an outer circumference test area 3f are sequentially allocated from the inner circumference side. It should be noted that the management data area is an area in which the medium manufacturer and the characteristic data are recorded in advance by the medium manufacturer at the time of mastering, and the test area is an area for the medium manufacturer and the drive device to check the characteristics of the medium. The user area is an area in which a user records, reproduces, erases information, etc. using a drive device.

In the recording area 1, from the inner peripheral edge to the outer peripheral edge, fine physical tracks are formed in a spiral shape or a concentric shape, for example, with guide grooves or the like, and tracking of recording / reproducing light is possible. I have to. The physical track included in the innermost zone 2a is divided into 10 sectors in the circumferential direction with reference to a reference position AA set in a straight line in a specific radial direction of the recording area 1. The physical track included in the second zone 2b from the innermost circumference has a circumferential direction of 11 with respect to the reference position AA.
It is divided into sectors. Similarly to this, as the number of sector divisions of the physical tracks included therein increases by one toward the outer peripheral zone, the physical tracks included in the outermost peripheral zone 2j are located at the reference position A-A. As a reference, the circumferential direction is divided into 19 sectors. Therefore, the head position of the first sector on each physical track is aligned with the reference position AA as shown in FIG.

In each sector of each physical track, a track address and a sector address peculiar to each sector are recorded in order to record, reproduce, and erase information for each sector. It should be noted that these track addresses and sector addresses are recorded in the form of fine prepits in the case of an optical information recording medium. In the present embodiment, regardless of the number of sector divisions of one physical track, one sector has 9 sectors.
An address format is set so that a logical track is formed and the boundary of each zone is always aligned with the reference position AA of the recording area 1.

The address format of the disk-shaped recording medium according to the embodiment will be described in more detail with reference to FIG. In addition,
FIG. 3 is an enlarged view showing a zone boundary portion of a spiral physical track, in which the last sector of one physical track is connected in front of the first sector of the next physical track. As shown in the figure, in the first zone 2a of the circumferential direction of the zone has been divided into 10 sectors, if the 0 sector of the logical track 2190 begins at the first sector of the physical track T _a, The last sector of the physical track T _a is the 0 sector of the logical track 2191, and the address of the first sector of the next physical track T _{a + 1} is the 1 sector of the logical track 2191. Similarly, the address of the first sector of the physical track of the next stage is deviated by one. Then, the last sector of the last physical track T _b included in the first zone 2a is (in the example of FIG. 3, eight sectors of 2199 logical track) ninth sector of one logical track completed in. The second zone 2b starts from the first sector of the next physical track T _{b + 1} and its address becomes sector 0 of the logical track 2200. Then, in the second zone 2b in which the circumferential direction of the zone is divided into 11 sectors, the last sector of the physical track _{Tb + 1} becomes one sector of the logical track 2201 and the next physical track _{Tb + 2.} The address of the first sector of 2 becomes the 2 sectors of the logical track 2201. Thus, in the second zone 2b, the address of the first sector of the physical track of the next stage shifts by 2.

As shown in FIG. 2, the boundary of each zone is always aligned in the same radial direction of the recording area 1 by multiplying the sector division number of one physical track by the total number of physical tracks contained in the zone. Can be realized by setting the number of sector divisions, the total number of physical tracks in the zone, and the number of sectors forming one logical track so that they are multiples of the number of sectors forming one logical track. In the example of FIG. 2, the first
Zone 2a is composed of a total of 2664 physical tracks, and the physical direction of each physical track is divided into 10 sectors. Therefore, the total number of sectors in the first zone 2a is 26640, which can be exactly divided by setting the number of sectors in one logical track to 9. That is, the physical track of 2664 turns corresponds to 2960 logical tracks, and the last sector in the zone is the same radial direction (reference position) A of the recording area 1.
-Can be aligned with A. The same is set for the other zones.

Further, in this embodiment, the first zone 2a and the tenth zone 2j are divided into a management data area 3a, a test area 3b and a user area 3c, and the boundary between these areas is always recorded. Region 1 in the same radial direction A-
The address format is set so as to align with A.

The address format at each area boundary in the first zone 2a will be described in more detail with reference to FIG. As shown in the figure, in the inner management data area, if the 0th sector of the logical track-10 starts from the reference position AA, the last sector of the physical track _Tc is the 0th sector of the logical track-9. And the next physical track T
The address of the first sector of _{c + 1} is ₁ in logical track-9.
It becomes a sector. Similarly, the address of the first sector of the physical track of the next stage is deviated by one. Then, the final sector of the final physical track T _d included in the inner circumference management data area 3a is completed by the ninth sector of one logical track (in the example of FIG. 4, eight sectors of −1 logical track). The inner peripheral test area 3b is used for the next physical track T.
Starting from the first sector of _{d + 1} , its address becomes 0 sector of logical track 0. And the physical track T
The last sector of _{d + 1} becomes 0 sector of logical track 1,
The address of the first sector of the next physical track T _{d + 2} becomes one sector of the logical track 1. In this way, also in the inner circumference test area 3b, the address of the first sector of the physical track of the next stage shifts by one. Then, the last sector of the last physical track T _e contained in an inner peripheral test area 3b is (in the example of FIG. 4, 8 sectors of 9 logical track) one ninth sector of the logical track completed in. The user area 3c starts from the first sector of the next physical track T _{e + 1} and its address becomes 0 sector of the logical track 10. Then, the last sector of the physical track T _{e + 1} becomes the 0 sector of the logical track 11, and the address of the first sector of the next physical track T _{e + 2} becomes the 1 sector of the logical track 11. As described above, also in the inner circumference test area 3b, the address of the start sector of the physical track of the next stage shifts by one.

In order to always align the boundary portions of the respective areas in the same radial direction of the recording area 1, the value obtained by multiplying the sector division number of one physical track by the total number of physical tracks included in the zone is the same as above. This can be realized by setting the number of sector divisions, the total number of physical tracks in the zone, and the number of sectors forming one logical track so that the number of sectors is a multiple of the number of sectors forming one logical track.

[0021] The gist of the present invention is that the address recorded in each sector is updated every time a sector address is repeated every fixed number of sectors regardless of the number of sector divisions and the sector address. The number of sectors constituting one logical track, the number of zone divisions of the recording area, and the boundary of each zone coincide with each other in the same radial direction of the recording area.
The number of sector divisions in the zone, the allocation of the area to each zone, and the like are not limited to those in the above embodiment, and can be appropriately changed as necessary. less than,
Other examples of the present invention will be listed.

The number of sectors forming one logical track is
It is the number of sector divisions of the CAV method which is currently generally used. By doing so, the LSI and microprogram of the drive device that performs replacement management can be shared, so that the versatility of the drive device between generations can be improved.

The number of sector divisions of the physical track of the specific zone may be the number of sector divisions of one logical track.

An area other than the user area, such as a management data area or a test area, can be divided into zones different from the user area.

In the user area, a RAM area in which information can be written and a ROM area in which only information can be reproduced can be mixed. 5, RAM in the user area
An example of a disk format of a disc-shaped recording medium in which areas and ROM areas are mixed is shown. It is considered that the contents of the disc format can be easily inferred from the comparison with FIG. 4, so the description thereof will be omitted to avoid duplication.

[0026]

As described above, according to the present invention,
Since the amount of information to be managed on the drive side can be greatly reduced, address management in the drive device can be made very simple. Further, since the boundaries of the zones or the divided areas are made to coincide with each other in the same radial direction of the recording area, there is no possibility that areas having different servo characteristics will coexist in one physical track, which facilitates tracking control. In addition, the stability of tracking can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a disk-shaped recording medium according to an example.

2 is a table showing an example of a track format of the disc-shaped recording medium shown in FIG.

FIG. 3 is an enlarged view of a main part of a disk-shaped recording medium at a zone boundary part.

FIG. 4 is an enlarged view of a main part of a disk-shaped recording medium at a region boundary part.

FIG. 5 is a plan view of an essential part in a region boundary part of a disk-shaped recording medium according to another example.

[Explanation of symbols]

 1 recording area 2a-2j zone 3a inner circumference management data area 3b inner circumference test area 3c first user area 3d tenth user area 3e outer circumference management data area 3f outer circumference test area

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Claims (4)

[Claims] 1. A ring-shaped recording area is divided into a plurality of zones having different radial areas, and the sector division number is increased toward the outer side in the circumferential direction of a spiral or concentric physical track formed in each zone. In a disk-shaped recording medium that is divided into a plurality of sectors so that the number of sectors is increased, the address recorded in each sector is a sector address repeated every fixed number of sectors regardless of the sector division number, and the sector address. And a track address updated every one cycle, and the disk-shaped recording medium is arranged so that the boundary portion of each zone is aligned with a reference position set in the same radial direction of the recording area. . 2. The disc-shaped recording medium according to claim 1, wherein at least one of the plurality of zones is divided into a plurality of areas having different purposes of use, and a boundary portion of each area is set to the reference position. A disk-shaped recording medium characterized by being aligned and arranged. 3. The disk-shaped recording medium according to claim 1, wherein the plurality of areas for different purposes are a user area,
A disc-shaped recording medium characterized by being a combination of a management area and a medium test area. 4. The disc-shaped recording medium according to claim 1, wherein at least one of the user areas is included.
One is divided into a RAM area in which information can be recorded and a ROM area in which only information can be reproduced, and the boundary portion of each area is arranged so as to match the reference position. recoding media.