Disk-shaped recording medium and disk recording or reproducing device

• US 5,953,297 A
• Filed: 10/22/1998
• Issued: 09/14/1999
• Est. Priority Date: 06/26/1995
• Status: Expired due to Term

• Current Assignee: Sharp Electronics Corporation (Hon Hai Precision Industry Co., Ltd.), Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Maeda, Shigemi, Kojima, Kunio
• Primary Examiner(s): Huber, Paul W.
• Application Number:
  US09/176,817
• Time in Patent Office: 327 Days
• Field of Search: 369/32, 369/33, 369/47, 369/48, 369/50, 369/124, 369/275.3, 369/275.4, 369/30
• US Class Current: 369/47.47
• CPC Class Codes: G11B 11/10565 Marks for track change, e.g. prepits, gray codes
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 2220/2525 Magneto-optical [MO] discs
• CPC Class Codes: G11B 27/19 by using information detectable on the record carrier
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/0045 Recording G11B7/006, G11B7/0065 take precedence
• CPC Class Codes: G11B 7/0053 Reproducing non-user data, e.g. wobbled address, prepits, BCA
• CPC Class Codes: G11B 7/007 Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• CPC Class Codes: G11B 7/00718 Groove and land recording, i.e. user data recorded both in the grooves and on the lands
• CPC Class Codes: G11B 7/00745 Sectoring or header formats within a track formats in general G11B20/12
• CPC Class Codes: G11B 7/24082 Meandering

Abstract

A disk-shaped recording medium has a groove only one of whose side-walls wobbles or deviates in radial directions of the disk in order to prerecord first address information. In addition, the disk medium has block areas in the groove and in the land where the first address information is given and sector areas provided with second address information for every piece of recording data which is divided into predetermined lengths, wherein `m` pieces of sector areas are allocated for `n` pieces of block areas and recorded in the groove and the land (both n and m are integral numbers, and n is smaller than m). The second address information based on the first address information enables the sectors to be set at any length, and improves reliability of the address information. Moreover, the second address information realizes high density recording using both the land and the groove.

Claims

1. A method of recording a disk-shaped recording medium having a groove section whose side-walls wobble or deviate in radial directions of the medium for prerecording first address information corresponding to each block area provided in the groove section, the recording method comprising the steps of:

(1) generating a plurality of pieces of second address information in accordance with the first address information reproduced from the disk-shaped recording medium, each piece of the second address information representing a sector which is a smaller recording and reproduction unit than the block area; and

(2) recording, into the block area corresponding to the first address information as the sector, data including a piece of the second address information generated in step (1) and recording data which is divided at a predetermined length.

2. A method of recording a disk-shaped recording medium having a groove section only one of whose side-walls wobble or deviate in radial directions of the medium for prerecording first address information allocated to a pair of blocks, i.e., each of the block areas in the groove section and a corresponding block area in the land section, the recording method comprising the steps of:

(1) generating a plurality of pieces of second address information in accordance with the first address information reproduced from the disk-shaped recording medium, each piece of the second address information representing a sector which is a smaller recording and reproduction unit than the block area; and

(2) recording, into the block area corresponding to the first address information as the sector, data including a piece of the second address information generated in step (1) and recording data which is divided at a predetermined length.

3. The method of recording the disk-shaped recording medium as defined in claim 2,

wherein, in the step (1), the second address information having the same second address values is generated for a groove sector provided in the block area of the groove section and for a land sector corresponding to the groove sector and provided in the block area of the land section having the same first address value with the block area of the groove section.

4. The method of recording the disk-shaped recording medium as defined in claim 2,

wherein, in the step (1), the second address information having different second address values from each other is generated for a groove sector provided in the block area of the groove section and for a land sector corresponding to the groove sector and provided in the block area of the land section having the same first address value with the block area of the groove section.

5. A recording device for a disk-shaped recording medium having a plurality of readable and writable block areas and a groove section at least one of whose side-walls wobble(s) or deviate(s) in radial directions of the medium for prerecording first address information corresponding to each of the block areas, comprising:

first address information identification means for identifying the first address information corresponding to a block area which is presently accessible from a state of the side-wall(s) of the groove section;

calculation means for calculating second address information representative of a desired sector area and the first address information representative of a desired block area provided with at least part of the sector area from address data representative of a sector area into which data is to be written; and

recording means for recording the data including the corresponding second address information and recording data into the desired sector area provided in the block area when the first address information sequentially obtained from the first address information identification means agrees with the first address information representative of the desired block area.

6. The disk recording device as defined in claim 5, further comprising synchronization pulse generating means for generating a synchronization pulse synchronizing with the first address information in accordance with the state of at least one of the side-walls of the groove section provided in advance to the disk-shaped recording medium,

wherein the recording means includes timing generating means for specifying from the synchronization pulse a timing to write the sector data into the specified sector area provided in the block area.

7. The disk recording device as defined in claim 5, further comprising access control means for judging whether the sector area into which the data is to be written is in the block area of the groove section or in the block area of the land section, and then instructing the recording means to access either the block area of the groove section or the block area of the land section.

8. The disk recording device as defined in claim 7,

wherein the calculation means calculates different second address information depending whether the desired sector area is in the block area of the groove section or in the block area of the land section.

9. The disk recording device as defined in claim 5, further comprising rotation control means for controlling rotation of the medium in accordance with the first address information sequentially obtained from the first address information identification means.

10. A reproducing device for a disk-shaped recording medium having a plurality of readable and writable block areas and a groove section at least one of whose side-walls wobble(s) or deviate(s) in radial directions of the medium for prerecording first address information corresponding to each of the block areas, comprising:

first address information identification means for identifying the first address information corresponding to a block area which is presently accessible from a state of at least one of the side-walls of the groove section;

second address information identification means for reading second address information corresponding to a sector area which is presently accessible out of a second address information area in a sector area provided in the block area;

calculation means for calculating second address information representative of a desired sector area and the first address information representative of a desired block area provided with at least part of the sector area from address data representative of a sector area out of which data is to be read; and

reproducing means for reading recording data out of a data area of the sector area when the first address information sequentially obtained from the first address information identification means agrees with the first address information representative of the desired block area, and the second address information sequentially obtained from the second address information identification means agrees with the second address information representative of the desired sector area.

11. The disk reproducing device as defined in claim 10, further comprising access control means for judging whether the sector area into which the data is to be written is in the block area of the groove section or in the block area of the land section, and then instructing the reproducing means to access either the block area of the groove section or the block area of the land section.

12. The disk reproducing device as defined in claim 10, further comprising rotation control means for controlling rotation of the medium in accordance with the first address information sequentially obtained from the first address information identification means.