Degauss waveform generator for perpendicular recording write...

Details Degauss waveform generator for perpendicular recording write... Degauss waveform generator for perpendicular recording write...

2008-05-13

2008-05-13

Nguyen, Hoa T. (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S068000, C360S062000, C360S046000

Reexamination Certificate

active

11331805

ABSTRACT:
Embodiments of the invention provide a hard disk drive that is capable of performing degaussing promptly and properly and a recording method for use with such a hard disk drive. A hard disk drive according to one embodiment of the present invention comprises a current source for supplying a first current, which flows to a write head for writing data onto a magnetic disk; a current source for supplying a second current, which flows to the write head when the polarity of the first current changes; transistors for reversing the polarity of a current flowing to the write head; and a control circuit for exercising control so that the second current I2,which flows from the current source to the write head when the polarity of the first current I1is reversed, becomes approximately zero before the first current I1converges to approximately zero during a degauss period.

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