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

1998-05-19

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 75, 360 53, G11B 1546

Patent

active

057543550

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 head contacts the projection. The flying height of the signal transducer head is lowered, e.g., by changing the disk rotation speed from the normal rotation speed in read/write operations or by heating a suspension having a bimetal element, while the signal transducer head is positioned over the detected projection on the track. The signal transducer head strikes the projection to break the projection. This avoids a subsequent error from being caused by the thermal asperity.

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Patent Abstracts of Japan, vol. 17, No. 311, P-1556, Jun. 14, 1993.
IBM Technical Disclosure Bulletin, vol. 34, No. 11, Apr. 1992, pp. 217-219, Fast Offset Recovery for Thermal Asperity Data Recovery Procedure.

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