Method to correct radial misposition of data tracks using stitched correction fields
US7315431B1 · kind B1 · utility
14Cited by
12References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2005 |
| Grant date | Jan 1, 2008 |
| Priority date | — |
| Expiry date | Nov 15, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive measures the radial misposition of tracks and repositions the tracks at regularly spaced intervals. Written in runout (WRO) in servo bursts is determined to calculate track spacing and squeeze among adjacent tracks. Tracks with improper spacing are repositioned by adding a squeeze correction term to the servo wedges. Thereafter, when the disk drive operates to store data, the servo bursts are used to calculate a position error signal (PES), and the squeeze correction term is combined with the PES to position the head at a proper track radius.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.