| 摘要 |
To 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 comprises a write current supply section and a write head (112a). 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 (112a) records data to the disk by the write current IW. The write current supply section comprises a write channel (121) to generate the write signal V1, a write driver A (202) to generate a write current IA from the write signal V1, a high frequency pattern extracting circuit (201) to extract high frequency pattern parts from the write signal, and a write driver B (203) to generate a write current IB from the extracted high frequency pattern parts. The write currents IA and IB are added up and supplied to the write head (112a) as the write current IW whose magnitude is amplified only when the frequency is high.
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