Magnetic recording/reproducing apparatus and magnetic...

Details Magnetic recording/reproducing apparatus and magnetic... Magnetic recording/reproducing apparatus and magnetic...

2006-11-28

2006-11-28

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

Reexamination Certificate

active

07142380

ABSTRACT:
Data is read out from a disk in which the data is recorded in the perpendicular magnetic recording system by a head, amplified by a head preamplifier, and signal-processed by a read channel LSI. A read-out processing unit of a HDD controller sends out signals processed by the read channel LSI as an output of the perpendicular magnetic recording system. Further, a cut-off frequency controlling unit of the HDD controller determines a cut-off frequency of a high-pass filter of the head preamplifier based on a data transfer rate read out by the read-out processing unit, controls a cut-off frequency changing unit, and changes the value of the cut-off frequency.

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