Magnetooptical recording method and apparatus utilizing shift ad

Details Magnetooptical recording method and apparatus utilizing shift ad Magnetooptical recording method and apparatus utilizing shift ad

1988-12-22

1991-10-22

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369124, 369 54, 369 58, G11B 1304, G11B 1112

Patent

active

050602080

ABSTRACT:
A method and apparatus for recording a signal in a magneto-optical disk having pre-pits formed on a recording track which pits are optically detectable for generation of data read and write clocks. The method and apparatus includes the steps of: prior to writing data in the magnetooptical disk, writing a test pattern on a leading portion of a data recording area of the magnetooptical disk at predetermined timings; reading the data recording area to generate a time shift between the read-out test pattern and the original test pattern; adjusting the predetermined timings in accordance with the time shift to generate adjusted data write timings; and writing data in the data writing area in accordance with the adjusted data write timings and the apparatus therefore.

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Uno, Japanese Patent Abstract, vol. 11, No. 156 (p. 578)[2603], 5-21-87, JP/61-292278.
Hashimoto, Japanese Patent Abstract, vol. 11, No. 148 (E. 506) [2595], 5/14/87, JP/61-287343.

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