Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1986-07-25
1988-06-14
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
047516933
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.
Kabushiki Kaisha Toshiba
McElheny Jr. Donald
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