Controls for optical disk relating to accessing and utilization

Details Controls for optical disk relating to accessing and utilization Controls for optical disk relating to accessing and utilization

1990-09-24

1992-07-21

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 32, 369 58, 3692753, G11B 700

Patent

active

051329549

ABSTRACT:
Rewriteable media, such as magnetooptic record members or disk has its recording controlled such that the recording is certifiable as meeting write once read many characteristics. Controls are introduced for the entire disk for indicating that the rewriteable disk is to be used for certified or vault writing, at least in some radial zones of the disk. Recording or writing operations are limited to those addresssable areas on the certifiable rewriteable medium that have not been previously written. Each of the addressable areas of the medium, in a disk termed, sectors, have a precursor portion called a control area which indicates the status of the sector and is used for preventing overwriting or erasure as well as controlling.

REFERENCES:
patent: 4498146 (1985-02-01), Martinez
patent: 4821254 (1989-04-01), Satoh et al.
patent: 4958314 (1990-09-01), Imai et al.
IBM Publication GA26-1661-8, Jan. 1985 pp. 4-13 and 4-14 (set File Mask).
IBM DOS Reference Manual, Feb. 1986 pp. 7-17 & 7-18 (DOS Attribute command).
IBM Data Processing Glossary 6th Ed. Oct. 1977, pp. 196, 238 and 239.

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