Optical memory with sampled tracking for a preformatted medium

Details Optical memory with sampled tracking for a preformatted medium Optical memory with sampled tracking for a preformatted medium

G - Physics

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G11B 7/00 (2006.01) G11B 7/004 (2006.01) G11B 7/08 (2006.01) G11B 7/125 (2006.01) G11B 11/105 (2006.01) G11B 19/02 (2006.01) G11C 13/04 (2006.01)

Patent

CA 1263893

ABSTRACT The present invention relates to optical memories for storing data on the surface of an information-supporting medium including pre-formatted patterns. Such a memory may constitute a random access mass memory, and it may be a read/write memory or it may be a write-once memory. The operations of writing to the memory and reading from the memory are based on the optical inter- action which occurs at the point of impact of an lncident optical beam which causes local changes in optical characteristics which are representative of the data when data is being written, and which produce optical modulation detectable by photoelectric means during data reading. The invention provides an optical memory in which the illumination mode common to reading data and to detecting pre-formatting patterns is modified in order to allow for operation in a standby mode or in order to delete areas reserved for storing data, for example.

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