Optical recording medium

Details Optical recording medium Optical recording medium

G - Physics

11

B

352/32.4

G11B 7/007 (2006.01) G11B 7/00 (2006.01) G11B 7/09 (2006.01) G11B 11/105 (2006.01) G11B 13/04 (2006.01) G11B 27/19 (2006.01) G11B 27/30 (2006.01) G11B 20/12 (2006.01)

Patent

CA 2023961

ABSTRACT OF THE DISCLOSURE An optical recording medium provided with both a recordable area in which data can be recorded and a read-only area in which data has previously been recorded in an unerasable manner. In the recordable area, a guide groove is previously formed for tracking control, and recording may be performed, for example photomagnetically, along the guide groove. In the read-only area, data is previously recorded by offsetting the groove or a land along the track in accordance with the data. This read-only data may be reproduced by detecting the laser light radiated from an optical pickup and reflected by the medium by a two- segment photodetector.

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