Servo pattern writing method for a disk storage device
US5012363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Feb 1, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/106
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disk drive device having multiple disks on a spindle, one of the disks is written with a servo pattern prior to assembly of the servo disk with blank disks into the disk enclosure. The servo pattern consists of a first pattern arranged on each track center along one radial direction of the disk, and a second pattern arranged along the radial direction at each position corresponding to the position of each sector. Servo patterns on each of the disks, including the original servo disk are then written on each of the disks based on the original servo disk. If the disks, when assembled exhibit eccentricity, the second pattern will still be detected, permitting servo writing without complex equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.