Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1991-11-19
1994-05-24
Pascal, Robert J.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 13, 369 48, 369 4426, G11B 700
Patent
active
053155670
ABSTRACT:
An optical disk according to the present invention has thereon an uninterrupted preformed groove adjoining a track. The address information of the track and sectors is prerecorded by variations in the preformed groove in a radial direction of the optical disk. An optical disk drive converts a detection signal, that is generated when the spot of a light beam crosses the track, into a binary signal in accordance with the comparison between the detection signal and two different slice levels, whereby a correct track crossing number is obtained. Another optical disk has thereon index marks that are prerecorded by partially varying the width of the preformed groove. Another optical disk drive detects the index mark on a specific track line, whereby formatting data with respect to address information is generated. The optical disks and optical disk drives are thus compatible with writing of the address information by means of soft-formatting.
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Fuji Hiroshi
Matoba Hirotsugu
Conlin David G.
Dinh Tan
Neuner George W.
Pascal Robert J.
Sharp Kabushiki Kaisha
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