Magnetic disk having data area and index servo area and servo system for positioning read/write head on magnetic disk
US4737869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Mar 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59688
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic disk comprises a data area and a single index servo sector area embedded in the data area. The servo sector has three or more servo information pattern sections formed side by side in the direction of data tracks in the data area. The servo information pattern sections each have a plurality of servo information bit cells formed in a predetermined pattern in a direction perpendicular to the direction of data tracks. The servo information bit cells are used to produce a position signal for positioning a read/write head. A servo system for positioning the read/write head averages a plurality of position signals obtained from the servo information pattern sections and uses the averaged position signal for positioning the read/write head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.