Optical disk recording and reading system with directory data ac

Details Optical disk recording and reading system with directory data ac Optical disk recording and reading system with directory data ac

1989-06-28

1991-12-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 30, 358340, G11B 700

Patent

active

050738879

ABSTRACT:
Directory data relating to user data are recorded in sectors of a checkerboard pattern or in sectors on every other track in a directory data area on an optical disk. The sectors which store the directory data are always flanked by adjacent virgin sectors in a direction normal to the tracks. Therefore, the latest directory data can be detected highly reliably without crosstalk noise from adjacent tracks. Alternatively, old directory data except the latest directory data are deleted or old directory data except the latest directory data and directory data in a predetermined number of sectors before the latest directory data are deleted, and the latest directory data can be detected highly reliably by detecting the deletion of the directory data.

REFERENCES:
patent: 4545044 (1985-10-01), Satoh et al.
patent: 4910724 (1990-03-01), Sakagami et al.

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