Method and apparatus for performing a memory operation on a fixe

Details Method and apparatus for performing a memory operation on a fixe Method and apparatus for performing a memory operation on a fixe

1984-06-27

1987-02-03

McElheny, Jr., Donald

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 50, 369111, G11B 7007

Patent

active

046412948

ABSTRACT:
An optical disk apparatus has an optical head for recording information on or reproducing information from an optical disk. The optical disk has a number of spiral or concentric tracks and a number of sectors formed along the circumferential direction of the disk. The sectors are divided into a plurality of sector blocks along the circumferential direction of the disk. Each sector block includes a different number of sectors which are continuous along the circumferential direction and which have a substantially constant linear length. A memory stores at least the speed data for maintaining a constant relative speed between the optical head and optical disk and is determined for each block group having a predetermined number of blocks. Speed data corresponding to the designated sector block is read out from the memory and is supplied to a velocity control circuit. A motor is driven to maintain a constant linear velocity between the optical head and the tracks of the optical disk.

REFERENCES:
patent: 4190860 (1980-02-01), Somers et al.
patent: 4361849 (1982-11-01), Bolger
patent: 4530018 (1985-07-01), Hoshino et al.
patent: 4550347 (1985-10-01), Nakamuta
Herald et al., "Zone Recording Flexible Diskette Drive Via Microprocessor Control", IBM Tech. Dis. Bul. vol. 23, No. 11, Apr. 1981, pp. 5068-5069.

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