Disk drive employing repeatable disturbance compensation for fly height control
US7675707B1 · kind B1 · utility
135Cited by
54References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2008 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Nov 21, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a disk, a head actuated over the disk, and control circuitry operable to generate a fly height control signal. A fly height of the head is measured, and the measured fly height is combined with a target fly height and a feedforward signal, wherein the feedforward signal is generated according to:a1·cos(2πn1k/N)+b1·sin(2πn1k/N)where a1 and b1 are coefficients and 2πn1k/N represents a frequency of a repeatable disturbance in the fly height of the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.