Magnetic disk apparatus, read gate optimization method and...

Details Magnetic disk apparatus, read gate optimization method and... Magnetic disk apparatus, read gate optimization method and...

2006-03-07

2006-03-07

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S053000, C360S031000, C714S047300, C714S769000

Reexamination Certificate

active

07009793

ABSTRACT:
A hard disk controller generates a read gate signal RG which has a predefined read start time and read end time set based on a sector pulse as a reference. A read data demodulation unit reproduces read data from a readout signal of medium by executing a read based on the read gate signal RG. A read gate optimization unit detects errors of read data demodulated by the data demodulation unit while varying the read start time and the read end time of the read gate signal RG, determines the read start time and the read end time at which the detected errors will be minimized and sets these in the read gate generation unit.

REFERENCES:
patent: 6229660 (2001-05-01), Chung

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