Interactive optical disk

Details Interactive optical disk Interactive optical disk

1989-05-25

1992-12-29

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

3692754, G11B 2300, G11B 374

Patent

active

051757206

ABSTRACT:
A method and apparatus for recording and reading both permanently stored information and user-supplied information on an optical disk are disclosed. The optical disk is provided with permanent information via pits in a substrate of the disk. User-supplied information is recorded in an expansion/retention layer adjacent the substrate. The permanent and user-supplied information may be read via laser beams having unequal wavelengths.

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