Reduction of high-frequency electromagnetic emission quasi-peaks from disk drives
US7518817B1 · kind B1 · utility
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20Claims
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Key dates
| Filing date | Jul 10, 2006 |
| Grant date | Apr 14, 2009 |
| Priority date | — |
| Expiry date | Jun 27, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/1493
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive having reduced electromagnetic emission quasi-peaks is provided. The repetition rate of servo blocks or data is reduced, spread or otherwise altered. In one embodiment, the number of data zones is increased to achieve an emissions reduction goal. In one embodiment, the disk drive is configured to effectively have one track per zone. In one embodiment, the rotation rate of the disk is varied or the effective data bit density, as detected by the read/write head, is otherwise varied. In one embodiment, servo-sectors are intentionally positioned to vary the length, along the track, of inter-servo intervals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.