Method of detecting protrusion on recording medium and...

Details Method of detecting protrusion on recording medium and... Method of detecting protrusion on recording medium and...

2005-09-13

2005-09-13

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

C360S075000, C360S076000, C360S039000, C360S055000, C360S077010, C360S077020

Reexamination Certificate

active

06943969

ABSTRACT:
An acoustic emission sensor is mounted on a flying slider opposed to a rotating recording medium, for example. The acoustic emission sensor outputs a detection signal in response to the sound of collision. When a protrusion exists on the recording medium, the flying slider is expected to collide against the protrusion at a predetermined fixed angular position. A variation is induced in the detection signal based on the collision between the flying slider and the protrusion in synchronization with the rotation of the recording medium. Specifically, when a variation is synchronized with the angular position signal of the recording medium, the variation should correspond to a protrusion existing on the surface of the recording medium. If the component corresponding to the variation is extracted out of the detection signal, a protrusion on the recording medium can be determined at a higher accuracy.

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“Acoustic Snesor for Head/Disk Assembly”, Aug. 1989, IBM Technical Disclosure Bulletin, vol. No. 32, Issue No. 3B, pp. 328-329.

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