Erasable optical disk and optical information recording/reproduc

Details Erasable optical disk and optical information recording/reproduc Erasable optical disk and optical information recording/reproduc

1992-02-14

1993-05-25

Porta, David P.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 32, 369 4426, 3692754, 369277, G11B 709

Patent

active

052146359

ABSTRACT:
This invention provides an erasable optical disk, on which information is recorded and reproduced repeatedly through the irradiation of laser beams, and an optical information recording/reproduction apparatus which records and reproduces information on the erasable optical disk. In erasing and then recording information on the erasable optical disk by using an erasing laser beam and a recording/reproduction laser beam, respectively, the tracking of both laser beams on the same track is detected so as to prevent erroneous erasing. The apparatus uses the optical disk having a mark signal disposed between a sector identifier and a data field, which mark signal is capable of determining the presence of the erasing laser beam on an adjacent track on the erasable optical disk, and the apparatus reproduces and detects the mark signal by using the erasing laser beam. The apparatus discriminates the position of the erasing laser beam depending on whether the mark signal has been detected or not, thereby preventing erroneous erasing of data on the adjacent track and simultaneously assuring the presence of the erasing laser beam on the same track along with the recording/reproduction laser beam.

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