Optical disk capable of storing information data at difference clock rates

• US 5,708,649 A
• Filed: 03/26/1996
• Issued: 01/13/1998
• Est. Priority Date: 11/05/1993
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kamoto, Hidetoshi, Wachi, Shigeaki
• Primary Examiner(s): Dinh, Tan
• Application Number:
  US08/622,699
• Time in Patent Office: 658 Days
• Field of Search: 369/275.3, 369/257.2, 369/13, 369/47, 369/48, 369/32, 369/59, 369/58
• US Class Current: 369/275.3
• CPC Class Codes: G11B 11/10584 characterised by the form, e.g. comprising mechanical protection elements
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 19/26 Speed-changing arrangements; Reversing arrangements; Drive-transfer means therefor
• CPC Class Codes: G11B 19/28 Speed controlling, regulating, or indicating G11B19/24 takes precedence
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: 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
• CPC Class Codes: 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
• CPC Class Codes: G11B 20/1866 by interleaving G11B20/1809 takes precedence
• CPC Class Codes: G11B 2220/213 Read-only discs
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/2525 Magneto-optical [MO] discs
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: 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
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/3063 Subcodes

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

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.

2. 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.

3. 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.

4. 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.

5. 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.

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

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