Disk drive which detects head flying height using first and second non-overlapping data patterns with different frequencies
US6894854B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2001 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Nov 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a system for determining whether the flying height of a read/write head above a disk in a disk drive is within an acceptable range, in substantially real time. The system relies on variations in read signal resolution with flying height to make the determination. In one embodiment, read signal resolution is measured and compared to a predetermined threshold value to determine whether the present flying height is in the desired range. In another embodiment, the number of peaks in a read signal that are detected (and/or not detected) by a detector is used to determine whether the head is in the proper flying height range. Because of read signal resolution effects, the number of detected peaks will decrease as the flying height of the head is increased. Means are also provided for postponing a transfer of data to/from the disk when it is determined that the head is not within the acceptable range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.