Method of and apparatus for overwritting a magneto-optic disk

Details Method of and apparatus for overwritting a magneto-optic disk Method of and apparatus for overwritting a magneto-optic disk

1989-09-27

1992-07-14

Levy, Stuart S.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369275, 369284, 360 59, G11B 1100, G11B 502, G11B 370

Patent

active

051309580

ABSTRACT:
Information on a spinning magneto-optic disk is overwritten by illuminating a spot on a track on the disk with an erasing beam in the presence of a biasing magnetic field, and illuminating another spot on the same track with a writing beam during the same revolution of the disk. The erasing beam and writing beam can be focused through the same lens. The erasing beam erases all bits to the same known value, so it is not necessary to control the writing beam according to the old values of the bits. Benefits include simpler control logic and less stringent positioning requirements than in the past.

REFERENCES:
patent: 4569881 (1986-02-01), Freese et al.
patent: 4649519 (1987-03-01), Sun et al.
patent: 4679180 (1987-07-01), Kryder et al.
patent: 4753853 (1988-06-01), Sato et al.
patent: 4771347 (1988-09-01), Horimai et al.
patent: 4855975 (1989-08-01), Akasaka et al.
patent: 4926402 (1990-05-01), Masarkawa
Direct Overwrite by Light Power Modulation on Magneto-Optical Multi-layered Media--Saito--Japanese Journal of Applied Physics vol. 26--1987.
High Speed Overwritable Magneto--Optic Recording--Nakao et al Japanese Journal of Applied Physics--vol. 26, 1987.

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