Method and apparatus for encoding and direct overwriting of magn

Details Method and apparatus for encoding and direct overwriting of magn Method and apparatus for encoding and direct overwriting of magn

1987-12-09

1989-10-03

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Head

Read only detector using light for reading magnetically...

360 59, G11B 5127, G11B 502

Patent

active

048720780

ABSTRACT:
Direct overwrite of data on magneto-optic medium is described. Old data is erased and new data is written during a single rotation of the media in a data storage system which includes a resonant coil for producing a high frequency alternating magnetic field interacting with laser pulses having a duration equal to a small fraction of the period of the magnetic field. Variable-length magnetic domains are formed by overlapping circular magnetic domains to provide pulse width modulation (PWM) encoding of data.

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patent: 3836895 (1974-09-01), DeJonge
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patent: 4340914 (1982-07-01), Hanaoka
patent: 4472748 (1981-12-01), Kato et al.
patent: 4495530 (1985-01-01), Yanagida

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