Track pitch control using head offset measurement for self-servowriting tracks in a disc drive
US6765744B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 19, 2001 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jan 2, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59611
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of, apparatus for, and means for controlling pitch of a servowritten track on a disc in a disc drive are disclosed. The disc drive has a head for traversing over a surface of the disc. The head has a read element and a write element separated by a head element offset &Dgr;. A servowriting controller operably connected to the disc drive creates a track k by writing servo information on the disc. The servowriting controller then calculates the head element offset &Dgr; at the track k, [&Dgr;CALC(k)] and determines a skew angle &thgr; at the track k, [&thgr;(k)]. The servowriting controller adjusts a track pitch correction factor based on the &Dgr;CALC(K) and the &thgr;(k) such that the track pitch correction factor is utilized to servowrite a next track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.