Memory disk having some capacity recording areas on a spiral tra

Details Memory disk having some capacity recording areas on a spiral tra Memory disk having some capacity recording areas on a spiral tra

1988-09-22

1990-06-19

McElheny, Jr., Donald

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 2300

Patent

active

049359177

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.

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Herald et al., Zone Recording Flexible Diskette Drive via Microprocessor Control, IBM Technical Disclosure Bulletin, vol. 23, No. 11, Apr. 1981.

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