Storage device having degauss circuitry with ramp generator for use in generating chirped degauss signal
US8773817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2012 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Nov 7, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/465
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.