Disk drive to estimate repeatable runout (RRO) based upon on an optimal mean square estimation (MSE) learning method
US7595954B1 · kind B1 · utility
108Cited by
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14Claims
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Key dates
| Filing date | Apr 18, 2006 |
| Grant date | Sep 29, 2009 |
| Priority date | — |
| Expiry date | Nov 20, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a method of estimating repeatable runout (RRO) for a disk drive. The method includes: determining a plurality of position error signal (PES) values for a plurality of servo wedges of a track of a disk; and estimating repeatable runout (RRO) in the PES values for the servo wedges of the track by averaging determined PES values over a pre-determined number of revolutions of the disk of the disk drive and scaling the averaged PES values by a pre-determined ratio of the variance of non-repeatable runout (NRRO) to the variance of an optimal estimation of the RRO for the disk drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.