Optical recording medium

Details Optical recording medium Optical recording medium

G - Physics

11

B

352/32.2, 352/32

G11B 7/013 (2006.01) G11B 7/007 (2006.01) G11B 7/08 (2006.01) G11B 7/085 (2006.01) G11B 20/12 (2006.01) G11B 27/10 (2006.01) G11B 27/19 (2006.01) G11B 27/24 (2006.01) G11B 27/30 (2006.01)

Patent

CA 1226671

ABSTRACT OF THE DISCLOSURE An optical disk is disclosed which records information that can be optically read. The disk has a spiral guide track. The disk further includes a single index field and a plurality of sectors. The index field includes an index mark that indicates the position at which an optical head is caused to jump for repeated trace of a specific portion of the guide track. Each of the sectors has a sector head and a data field that comes following the sector head. The sector head comprises a sector mark located at the head of the sector and an address field. This address field contains a track address, a sector address, and an error detecting and correcting code. The index mark in the index field is detected, and the optical head is made to perform a jumping operation in response to the resulting signal, whereby the jumping operation is rendered certain. When the address fields are being read, if some sector addresses cannot be read due to drop-out or for other cause, the signal produced by detecting the index marks are counted by a counter into which the signal produced by detecting the sector marks is clocked, for preparing the sector addresses.

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