Disk drive apparatus and read error recovery method in a disk dr

Details Disk drive apparatus and read error recovery method in a disk dr Disk drive apparatus and read error recovery method in a disk dr

1996-04-17

1997-12-09

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 75, G11B 1546

Patent

active

056966431

ABSTRACT:
A disk drive apparatus and read error recovery method in a disk drive apparatus removes thermal asperities on disk surfaces. A projection, such as a thermal asperity, on the recording surfaces of disks is detected when a signal transducer contacts the projection. The flying height of the signal transducer is lowered, e.g., by reducing the disk rotation speed from the normal rotation speed in read/write operations, while the signal transducer is positioned over the detected projection on the track. The signal transducer strikes the projection to break the projection. This avoids a subsequent error from being caused by the thermal asperity.

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PATENTS ABSTRACTS OF JAPAN, vol. 17, No. 311, P-1556, Jun. 14, 1993.
IBM Technical Disclosure Bullentin, vol. 34, No. 11, Apr. 1992. pp. 217-219 .

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