System, method, and apparatus for glide head calibration with enhanced PZT channel for very low qualification glide heights
US7121133B2 · kind B2 · utility
10Cited by
11References
8Claims
0Family size
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Key dates
| Filing date | May 28, 2004 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Dec 3, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A glide head calibration technique uses two fly height calibrations on a disk media certifier. The first calibration point uses a spin down on bump technique at a first height, and the second calibration point uses a spin down on disk media roughness at a second lower height. With two height data points, a fly height curve of each glide head is approximated very accurately. Once the fly height curve is derived for each head, any fly height can be dialed-in by the disk media certifier for glide testing. This technique achieves glide fly heights between about 4 nm and 8 nm and does so with improved tolerances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.