# US 5,708,649 A · Optical disk capable of storing information data at difference clock rates

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- Number: US 5,708,649 A
- Document ID: US5708649A
- Status: Granted
- Kind: A
- Application number: 08/622,699
- Filed: 1996-03-26
- Granted: 1998-01-13
- Earliest claimed: 1993-11-05
- Assignees: Sony Corporation
- Inventors: Hidetoshi Kamoto; Shigeaki Wachi
- Web page: https://patentgrep.com/patent/US5708649A

## CPC

- G11B 27/24: by sensing features on the record carrier other than the transducing track {; sensing signals or marks recorded by another method than the main recording}
- G11B 19/12: by sensing distinguishing features of {or on} records, e.g. diameter {end mark}
- G11B 19/26: Speed-changing arrangements; Reversing arrangements; Drive-transfer means therefor
- G11B 19/28: Speed controlling, regulating, or indicating (G11B19/24 takes precedence)
- G11B 20/10: Digital recording or reproducing
- G11B 20/12: Formatting, e.g. arrangement of data block or words on the record carriers {(within interface between computers and data recorders G06F3/06)}
- G11B 20/1258: {where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs}
- G11B 27/3027: {used signal is digitally coded}
- G11B 27/3063: {Subcodes}
- G11B 11/10584: {characterised by the form, e.g. comprising mechanical protection elements}
- G11B 11/10595: {Control of operating function}
- G11B 20/1866: {by interleaving (G11B20/1809 takes precedence)}
- G11B 2220/213: Read-only discs
- G11B 2220/216: Rewritable discs
- G11B 2220/2525: Magneto-optical [MO] discs
- G11B 2220/2545: CDs
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A disk storage medium, for example, a magneto-optical compact disk, includes a plurality of data areas that have data stored therein and a plurality of address areas each associated with a respective data area and that have address data stored therein. The data in each of the data areas are stored at respectively different clock rates, and all of the address data in all of the address areas are stored at the same constant clock rate.

## Claims

### Claim 1

A disk storage medium, comprising:
a plurality of data areas having data stored therein, said data in each of said data areas being stored at respectively different clock rates; and
a plurality of address areas each associated with a respective data area having address data stored therein, all of said address data being stored at the same constant clock rate.

### Claim 2 (depends on 1)

The disk storage medium of claim 1, wherein said plurality of data areas are located in respective concentric circular zones on said disk storage medium, said clock rate of said data in each of said data areas corresponding to said zone in which said respective data area is located.

### Claim 3 (depends on 2)

The disk storage medium of claim 2, wherein said concentric circular zones include outer zones and inner zones, and said clock rate of data stored in a data area located in one of said outer zones is greater than said clock rate of data stored in a data area located in one of said inner zones.

### Claim 4 (depends on 2)

The disk storage medium of claim 2, wherein said address data in each of said address areas identifies said zone in which said respective address area and associated data area are located.

### Claim 5 (depends on 1)

The disk storage medium of claim 1, wherein said address data in each of said address areas is stored in a pre-pit format, and said data in each of said data areas is stored in a magneto-optical format.

### Claim 6 (depends on 1)

The disk storage medium of claim 1, wherein said disk storage medium is a compact disk magneto-optical (CD-MO) storage medium.

### Claim 7 (depends on 1)

The disk storage medium of claim 1, wherein an angular length of each of said address areas is equal.