Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1988-03-11
1989-06-13
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 32, 369 58, G11B 700
Patent
active
048398780
ABSTRACT:
A disk control device for controlling the positioning of an optical disk having address sections in each of which a plurality of identical track addresses and a plurality of identical sector addresses are written. Data are written in a sector specified by a designated track address and a designated sector address when the result of comparison of the designated track address for starting writing and track addresses read out of an optical disk shows coincidence of the designated track address and any of the track addresses read out and, at the same time, the result of comparison of the designated sector address for starting writing and sector addresses read out of the disk shows that one of the sector addresses is identical with the designated sector address, and when at least one of the results of comparison of the designated track address and the track addresses written in the address sections of the individual sectors which are defined in one track is representative of coincidence. This allows data to be written in the sectors without forcibly leaving any of the sectors empty or non-written. Even if the address section of any of the sectors is scratched after data have been written therein, those data can be successfully read out only if the track addresses written in the address sections of the other sectors of the same track is coincident with the designated track address.
REFERENCES:
patent: 4546462 (1985-10-01), Koishi et al.
patent: 4768181 (1988-08-01), Ichinose et al.
NEC Corporation
Richardson Robert L.
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