Using an external spiral servo writer to write reference servo sectors and spiral tracks to a disk to facilitate writing product servo sectors to the disk
US6965489B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2004 |
| Grant date | Nov 15, 2005 |
| Priority date | — |
| Expiry date | Apr 29, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59661
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of writing product servo sectors to a disk of a disk drive is disclosed. An external spiral servo writer writes a plurality of reference servo sectors at an outer diameter of the disk and a plurality of spiral tracks that spiral from an outer diameter to an inner diameter of the disk. At the beginning of the product servo writing process, the reference servo sectors are demodulated to initially synchronize a servo write clock. The spiral tracks are then demodulated to maintain synchronization of the servo write clock as well as maintain the head along a target circumferential path while writing product servo sectors to the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.