Method for mapping thermal asperities of a magnetic recording su

Details Method for mapping thermal asperities of a magnetic recording su Method for mapping thermal asperities of a magnetic recording su

1995-05-19

1996-07-16

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 721, G01R 3312

Patent

active

055370349

ABSTRACT:
In a disk drive, the tendency of a flying head to physically engage a constant-speed data recording disk when the drive is operated at an altitude higher than the altitude at which the drive was manufactured is tested by. During manufacture of the drive, the constant disk speed is reduced to a lower speed that is a function of a mathematical relationship between the manufacturing altitude to the higher altitude. The invention then determines if the head in fact physically engages the disk at this lower speed. In an embodiment, this lower speed is calculated as a function of the ratio of the manufacturing altitude to the higher altitude. An embodiment of the invention provides a rotatable rigid magnetic recording disk and a magneto-resistive (MR) head that is generally stationary relative to the rotating disk.

REFERENCES:
patent: 5233482 (1993-08-01), Galbraith et al.

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