Error recovery method and disk drive apparatus to superimpose a

Details Error recovery method and disk drive apparatus to superimpose a Error recovery method and disk drive apparatus to superimpose a

1996-11-20

1999-03-09

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 25, G11B 2736

Patent

active

058809007

ABSTRACT:
A disk drive apparatus and a method for executing an error recovery process for an error caused by thermal asperity is set forth by positioning a disk read/write head in the vicinity of a thermal asperity and then by vibrating the head so that the head hits the foreign matter or protrusion on the surface of the disk causing the thermal asperity. Vibrations in the longitudinal direction are generated in a head by supplying a vibration signal to VCM. The vibration signal is superimposed on a head driving signal. During the vibration process, the head is positioned on a track shifted from a thermal asperity causing track by several tracks in order to hit the thermal asperity by an edge of a head.

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Kobayashi, Stuck Object Removing Method For Head, Patent Abstracts of Japan, vol. 15, No. 435, Nov. 1991.
Yamada, Manufacture of Magnetic Disk Medium, Patent Abstracts of Japan, vol. 11, No. 370, Dec. 1987.

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