Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same
US6510015B2 · kind B2 · utility
25Cited by
87References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 30, 2000 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Nov 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic medium comprises a magnetic disc having a read surface that has a plurality of tracks, at least some having servo sectors. The servo sectors comprise a plurality of magnetic irregularities, such as pits or regions of reduced magnetic coercivity, arranged in a servo pattern along the servo sector at a servo frequency. A magnetic pattern is recorded in the disc along the servo sector at a high carrier frequency. A process for manufacturing the servo pattern and for recovering servo data from the servo pattern are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.