Device and method for adjusting distance between magnetic...

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

Reexamination Certificate

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C360S031000, C360S097020

Reexamination Certificate

active

07602573

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.

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patent: 7369341 (2008-05-01), Yokohata et al.
patent: 2003/0174430 (2003-09-01), Takahashi et al.
patent: 2005/0046982 (2005-03-01), Liu et al.
patent: 2005/0152055 (2005-07-01), Biskeborn
patent: 05-081807 (1993-04-01), None

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