Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-07-10
2009-10-13
Olson, Jason C (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
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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Olson Jason C
Samsung Electronics Co,. Ltd.
Volentine & Whitt PLLC
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