Servo frame defect mapping in a hard disc drive

Details Servo frame defect mapping in a hard disc drive Servo frame defect mapping in a hard disc drive

1997-03-26

1999-02-09

Hindi, Nabil

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 53, G11B 5596

Patent

active

058702431

ABSTRACT:
Apparatus and method for detecting defective servo frames in a disc drive, the defective servo frames including anomalous position field patterns which generate burst signals of insufficient relative magnitude to facilitate proper servo control. Burst signals are generated from the position field patterns of a selected servo frame and a combination term is determined as a selected combination of the magnitudes of the burst signals. The combination term is compared to a predetermined threshold and the servo frame is identified as being defective when the combination term falls below the predetermined threshold. The combination term is preferably generated from the magnitudes of burst signals generated from three burst patterns: a first burst pattern extending from a first track boundary to a second, adjacent track boundary, a second burst pattern extending from a track centerline to the first track boundary and a third burst pattern extending from the track centerline to the second track boundary.

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