STORAGE DEVICE HAVING DEGAUSS CIRCUITRY CONFIGURED FOR GENERATING DEGAUSS SIGNAL WITH ASYMMETRIC DECAY ENVELOPES

摘要

A hard disk drive or other storage device comprises a storage medium, a write head configured to write data to the storage medium, and control circuitry coupled to the write head. The control circuitry comprises degauss circuitry coupled to or otherwise associated with one or more write drivers. The degauss circuitry is configured to generate an asymmetric degauss signal to be applied to the write head. The asymmetric degauss signal has a waveform with upper and lower decay envelopes that are asymmetric about a specified degauss current level, such as a substantially zero current level.

主权项

1. An apparatus comprising:
control circuitry adapted for coupling to a write head configured to write data to a storage medium; wherein the control circuitry comprises: a write driver; and degauss circuitry associated with the write driver and configured to generate an asymmetric degauss signal to be applied to the write head, the asymmetric degauss signal having a waveform with upper and lower decay envelopes having respective different decay rates.