Demodulating servo sectors and spiral tracks using common circuitry
US6989954B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2004 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Jan 31, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59688
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing a disk drive by demodulating product servo sectors and spiral tracks written on a disk of the disk drive is disclosed. An external spiral servo writer writes a plurality of spiral tracks that spiral from an outer diameter to an inner diameter of the disk. Each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark. The spiral tracks are used to write product servo sectors to the disk during a fill operation. Common circuitry, such as burst demodulation circuitry, is used to demodulate the high frequency signal in the spiral tracks during the fill operation as well as demodulate the product servo sectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.