Demagnetizing a head in a disk drive by increasing the...

Details Demagnetizing a head in a disk drive by increasing the... Demagnetizing a head in a disk drive by increasing the...

2006-08-15

2006-08-15

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

C360S046000, C360S066000, C360S068000

Reexamination Certificate

active

07092186

ABSTRACT:
A disk drive is disclosed which demagnetizes the head after a write operation. Write circuitry applies a write signal to the head in order to write data to a selected data sector during a write operation, wherein the write signal comprises a predetermined write current amplitude. Control circuitry demagnetizes the head at the end of the write operation by maintaining the write current amplitude while increasing a frequency of an AC write signal applied to the head over a predetermined demagnetization interval, wherein increasing the frequency of the AC write signal decreases an amplitude of the AC write signal when observed at the head.

REFERENCES:
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patent: 3591729 (1971-07-01), Camras
patent: 4135219 (1979-01-01), Yoshizawa et al.
patent: 4224649 (1980-09-01), Alexandrovich, Sr.
patent: 4970621 (1990-11-01), Gailbreath et al.
patent: 5168395 (1992-12-01), Klaassen et al.
patent: 2005/0200997 (2005-09-01), Cronch et al.

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