Method and apparatus for evasive maneuvering to keep DASD heads

Details Method and apparatus for evasive maneuvering to keep DASD heads Method and apparatus for evasive maneuvering to keep DASD heads

1996-11-26

1999-02-09

Edun, Muhammad N.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 53, 369 53, G11B 5596, G11B 700

Patent

active

058702415

ABSTRACT:
Apparatus and a method are provided for mapping aperities or protruding disk defects in a data storage disk file. A protruding disk defect is identified and a head and disk interference value is measured. The measured head and disk interference value is compared with a predetermined threshold value. A severity value is determined responsive to the compared values and stored with a location of the identified protruding disk defect. A no-idle zone is defined relative to the location of the identified protruding disk defect based upon the severity value and a geometry of an airbearing slider. Evasive maneuvering is performed to avoid slider and transducer head contact with the identified protruding disk defect.

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