Method and implementation of in-situ absolute head medium spacing measurement
US7016131B2 · kind B2 · utility
52Cited by
3References
25Claims
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Key dates
| Filing date | Aug 29, 2003 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Nov 15, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method based on readback signal for in-situ measuring of absolute head-medium spacing, a pre-encoded pattern in the magnetic medium on a disk has at least two harmonics with amplitudes such that a linear function of the logarithmic ratio of the spacing loss-term is formed in relation to testing frequencies. This linear function is applied to determine the absolute head-medium spacing directly through the multiplication of gradient of the linear function and the linear velocity between the head and the medium of the disk drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.