Apparatus and method to minimize amplitude variations associated with media/head response characteristics in servo writing of perpendicular magnetic recording
US7580213B2 · kind B2 · utility
0Cited by
6References
20Claims
0Family size
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Key dates
| Filing date | Mar 21, 2007 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | May 5, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59616
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo writer that writes servo information onto a disk of a hard disk drive. The writing of the servo can be synchronized by a clock track that contains a clock read back signal. The clock read back signal is differentiated by a differentiator circuit. A clamping circuit clamps the clock read back signal to minimize signal ringing, undershoot and overshoot phenomena in the signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.