Track pitch examination method of storage apparatus, program, and storage apparatus
US7529058B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2007 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Jul 20, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59688
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Track pitches of all the tracks of a disk medium provided in a storage apparatus are examined in a manufacturing examination step. First of all, a target position path which varies a target track position so that the position crosses the tracks is generated, and a head actuator is subjected to feedback control so that head detection positions track the target position path. Track pitch abnormality is determined when an error between the target position path and the head detection positions exceeds a predetermined threshold value, and the track number is recorded in a track skip table of the medium. As the target position path, a target position sine-wave path having the amplitude of the width of plural tracks is generated in synchronization with rotation of the medium. As another target position path, a target position straight-line path which passes each track interval in certain time between the outermost and the innermost of the medium is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.