Method and apparatus for write head demagnetization

Details Method and apparatus for write head demagnetization Method and apparatus for write head demagnetization

2005-02-04

2008-08-12

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S046000

Reexamination Certificate

active

07411756

ABSTRACT:
An apparatus and method for demagnetizing a write head of a disc drive. Under control of a clock oscillator, synthetic demagnetizing pulses are generated and applied to a writer-driver bridge. Also under control of the clock oscillator, a write current produced by the writer-driver bridge incorporates the demagnetizing pulses and ramps down to about zero. The train of demagnetizing pulses and the write current ramp down demagnetizes the head, reducing write head magnetic bias that may influence the proximate read head of the disc drive head.

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patent: 7088537 (2006-08-01), Cronch et al.
patent: 7092186 (2006-08-01), Hogg
patent: 7106536 (2006-09-01), Fang et al.

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