Write current boosted head amplifier

Details Write current boosted head amplifier Write current boosted head amplifier

2006-12-12

2009-10-20

Olson, Jason C (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

C360S065000, C360S068000

Reexamination Certificate

active

07605993

ABSTRACT:
Embodiments in accordance with the present invention provide a disk drive and a control method in the disk drive which can obtain good recording performance by amplifying the write current according to the recording method and the recording frequency. A HDD in accordance with an embodiment of the present invention comprises a write current supply section and a write head. The write current supply section generates a write signal for recording to a disk and, based on the write current, generates a write current IW. The write head records data to the disk by the write current IW. The write current supply section comprises a write channel to generate a write signal, a write driver to generate a write current from the write signal, a high frequency pattern extracting circuit to extract high frequency pattern parts from the write signal, and a write driver to generate a write current IBfrom the extracted high frequency pattern parts. The write currents and are added up and supplied to the write head as the write current whose magnitude is amplified only when the frequency is high.

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The Extended European Search Report for Application No. 06024045.4-2210, dated Jun. 20, 2008, 8 pages total.

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