Using servo data harmonics to monitor head-medium spacing
US7948704B2 · kind B2 · utility
7Cited by
12References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 17, 2008 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Jul 9, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is disclosed that includes measuring a first amplitude and a second amplitude in a servo pattern signal derived from a transducer head interacting with a medium; and providing an indication of a change in a spacing distance between the head and the medium, wherein the change in the spacing is evaluated using a spacing relation derived from a ratio of the first harmonic amplitude and the second harmonic amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.