Disk glide testing with zone detection

Details Disk glide testing with zone detection Disk glide testing with zone detection

1998-08-18

2000-10-31

Patidar, Jay

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 7804, 73105, G01R 3312

Patent

active

06140814&

ABSTRACT:
A glide testing apparatus includes a motor assembly, a sensor element, a positioning assembly, and detection circuitry. The motor assembly rotates a magnetic disk about an axis. The sensor element produces a detection signal in response to disk surface characteristics. The positioning assembly positions the sensor element at selected radii from the axis of disk rotation, and the detection circuitry receives a signal from the sensor element to detect movement of the sensor element between a first zone on the disk and a second zone on the disk. Methods of distinguishing between two adjacent zones on a magnetic disk include rotating a magnetic disk about an axis and positioning a sensor element at selected radii from the axis of rotation. The methods can also include producing a signal in response to variations in the distance between the sensor element and the disk surface, and determining if the sensor element is positioned in a first disk zone or in a second disk zone by analyzing selected zone signal characteristics that distinguish the first disk zone from the second disk zone.

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Erick Sawatzky, "Thermal asperities: MR heads face new dangers", Data Storage, Feb. 1998, pp. 49-54.
E. Schreck et al., "Magnetic Readback Microscopy Applied To Laser-Texture Characterization In Standard Desktop Disk Drives", Advanced Technology Group, Maxtor Corporation, Oct. 17, 1997.

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