Method and apparatus for self servowriting of tracks of a disk drive using an observer based on an equivalent one-dimensional state model
US7046472B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2003 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Aug 4, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59655
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for writing servo patterns for tracks on a rotating magnetic disk medium of a magnetic disk drive. In the method, track following is performed along a reference track, defined by previously written servo burst patterns, using a servo loop having a closed-loop response. A position error signal is generated for the reference track based on the track following. A correction signal is generated based on the track following using an observer of a one-dimensional state model that is equivalent to the two-dimensional state model of the servo loop. Servo patterns are written at a target radial location on the magnetic disk medium during track following of the reference track. The position error signal of the servo loop is adjusted based on the correction signal to reduce radial error propagation from the reference track to the servo burst patterns at the target radial location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.