Storage device having degauss circuitry with ramp generator for use in generating chirped degauss signal

摘要

A hard disk drive or other disk-based storage device comprises a storage disk, a write head configured to write data to the disk, and control circuitry coupled to the write head. The control circuitry comprises a write driver and degauss circuitry associated with the write driver. The degauss circuitry is configured to generate a chirped degauss signal to be applied to the write head by the write driver. The degauss circuitry comprises a ramp generator configured to generate a ramp signal for controlling a frequency of at least a portion of a waveform of the chirped degauss signal. The ramp signal generated by the ramp generator may comprise a current ramp that is applied to a control input of a current controlled oscillator of the degauss circuitry.

主权项

1. An apparatus comprising:
control circuitry adapted for coupling to a write head configured to write data to a storage disk, the control circuitry being configured to process data supplied to the write head; wherein the control circuitry comprises: a write driver; and degauss circuitry associated with the write driver and configured to generate a chirped degauss signal to be applied to the write head by the write driver; wherein the degauss circuitry comprises a ramp generator configured to generate a ramp signal for controlling a frequency of at least a portion of a waveform of the chirped degauss signal; and wherein the ramp generator is configured to set a start frequency and a stop frequency for said waveform responsive to respective start and stop frequency control signals.