Determining contact write current in disk drive using position error signal variance
US7224548B1 · kind B1 · utility
13Cited by
30References
59Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 6, 2003 |
| Grant date | May 29, 2007 |
| Priority date | — |
| Expiry date | Sep 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disk drive, a contact write current that causes head-disk contact due to pole tip protrusion is detected using a variance of a position error signal (PES). A method of determining the contact write current includes generating PES's in response to the head reading servo sectors on the disk, calculating PES variances wherein each PES variance is a statistical measure of a different group of the PES's, calculating a change in the PES variances, and selecting the contact write current in response to the change in the PES variances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.