Adjusting track density over disk radius by changing slope of spiral tracks used to servo write a disk drive
US6987636B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2004 |
| Grant date | Jan 17, 2006 |
| Priority date | — |
| Expiry date | Oct 13, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is disclosed for adjusting the track density over the disk radius by changing the slope of spiral tracks used to servo write a disk drive. A plurality of spiral tracks are written to the disk wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark. A slope of the spiral tracks over a first radial segment of the disk is substantially steeper than the slope of the spiral tracks over a second radial segment of the disk. The head internal to the disk drive is used to read the spiral tracks in order to write product servo sectors to the disk to define a plurality of data tracks. The steeper slope of the spiral tracks over the first radial segment causes a track density of the data tracks to be lower over the first radial segment compared to the track density of the data tracks over the second radial segment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.