Reduction of high-frequency electromagnetic emission quasi-peaks from disk drives
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United States of America Patent
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Apr 14, 2009
Grant Date -
N/A
app pub date -
Jul 10, 2006
filing date -
Jul 8, 2005
priority date (Note) -
Expired
status (Latency Note)
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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.
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