Position sunsitivity adjusting method for disk apparatus and a disk apparatus using the same
US5907449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Mar 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59605
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A position sensitivity adjusting method for a disk apparatus and a disk apparatus using the same for adjusting an AGC (Automatic Gain Control) amplifier for amplifying a servo signal on a servo surface of a disk medium, involves positioning a servo head at a boundary of tracks on the servo surface. The method then includes setting a plurality of different adjustment values in the AGC amplifier, reading two position signals through the servo head for each adjustment value, and calculating a dispersion value of the position signals for each adjustment value. After the adjustment value for the AGC amplifier which provides the minimum dispersion value is acquired from the calculated dispersion values, the acquired adjustment value is set in the AGC amplifier. With the adjusting method, even when offset compensation for positioning the servo head at a track boundary is executed, a positioning error can be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.