Magnetic disk apparatus having noise detection

Details Magnetic disk apparatus having noise detection Magnetic disk apparatus having noise detection

1997-05-29

2000-04-04

Faber, Alan

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 46, 360 67, 360 68, 360 60, G11B 2736

Patent

active

06046870&

ABSTRACT:
In a magnetic disk apparatus performing a positioning operation in a sector servo system, an AGC amplification gain measuring circuit measures an amplification gain of an AGC amplifier on the basis of the reproduction of a magnetic pattern in an AGC region within a servo area of a magnetic disk. An AGC amplification gain judgment circuit judges whether the value of the amplification gain measured by the AGC amplification gain measuring circuit is out of a set range, and outputs the judgment result. When receiving from the AGC amplification gain judgment circuit a judgment result indicating that the value of the amplification gain is out of the set range, a recording/reproducing operation control circuit stops the recording operation of a recording circuit.

REFERENCES:
patent: 5461517 (1995-10-01), Suda et al.
patent: 5831781 (1998-11-01), Okamura
Office Action Issued by the Japanese Patent Office on Jan. 16, 1999 for the Corresponding Japanese Application and a Translation Thereof.

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