Device and method for specifying control value for controlling clearance between head and disk, and magnetic disk drive device
US7852594B2 · kind B2 · utility
3Cited by
12References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 2008 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Jun 2, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/607
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention help to detect contact between a head and a magnetic disk more accurately in specifying a heater power value for adjusting a clearance between a head element portion and the disk. According to one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) measures amplitudes of read signals in a user data field DATA. A hard disk drive (HDD) fills a gap between servo data with single data sector. The HDC/MPU measures the amplitudes of read signals in each data sector at different heater power values. It determines the heater power value at which contact occurs from the measured values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.