Device and method for adjusting distance between magnetic head and data storage medium
US7602573B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2007 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Jul 10, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/607
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device and method for adjusting a distance between a magnetic head and a data storage medium are provided. In the device, a microprocessor outputs a control signal for adjusting the distance to a pre-amplifier based on a correlation between a flying height (FH) and a coefficient of a fifth tap of an adaptive digital filter included in a read/write (R/W) channel circuit or a correlation between the FH and a discrete Fourier transformed third harmonic signal output from the R/W channel circuit. The pre-amplifier outputs a voltage or current for flying on demand (FOD) to the magnetic head based on the control signal. The magnetic head adjusts the distance in real time based on the voltage or current for FOD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.