PES linearization scheme for disk drive servo using small excitation bode measurements
US6369971B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1999 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Aug 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5526
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PES linearization scheme using small excitation bode measurements is provided to account for non-linearity characteristics during measurements of head element positions so to generate a more accurate read and write operation by a head element of a disk drive assembly. The PES linearization scheme of this invention provides making gain measurements as the head element moves across the track, and then integrating the result to get a relative PES profile. By then finding two points on the profile a known distance apart, we can multiply the profile by the appropriate gain factor to get an absolute PES profile. This profile can be then be used as a look up table to convert raw PES numbers into actual position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.