Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1984-10-25
1988-04-05
Cardillo, Raymond F.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369275, 369 59, G11B 2108, G11B 724
Patent
active
047363525
ABSTRACT:
An optical disk for optical recording and reproducing data has a spiral track and 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 of the optical recording and reproducing apparatus retraces a spiral track by jumping a specific portion of the guide track. Each of the sectors has a sector header, which comprises a sector mark located at the start of the sector and an address field including a track address, sector address, and an error detecting and correcting code. The index mark in the 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 there is a failure to read the address fields, the signal produced by detecting the index mark starts a counter which counts the signal produced by detecting a sector mark, for recovering the sector address.
REFERENCES:
patent: 4022986 (1977-05-01), Teer et al.
patent: 4535439 (1985-08-01), Satoh et al.
patent: 4539664 (1985-09-01), Deguchi et al.
patent: 4545044 (1985-10-01), Satoh et al.
patent: 4546462 (1985-10-01), Koishi et al.
patent: 4555736 (1985-11-01), Mathieu et al.
Matsuo Tamotsu
Satoh Isao
Cardillo Raymond F.
Garland Steven R.
Matsushita Electric - Industrial Co., Ltd.
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