Methods, apparatus and program products for determining off-track time shaft estimates to be used in writing timing patterns on a storage medium
US6411453B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1998 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Sep 3, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5526
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Off-track time shift estimates are determined and used in order to write subsequent trigger patterns on a storage medium at different track pitches. Various procedures for determining an off-track time shift estimate are provided. These procedures include measuring time intervals between a related set of trigger patterns and another trigger written on the storage medium; measuring time intervals between a motor index and a particular trigger pattern at two different radial locations; measuring the difference in the center location of two trigger patterns written at different radial locations; and microjogging a recording transducer during the interval between two different trigger patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.