Disc drive error mapping using threshold comparison methods

Details Disc drive error mapping using threshold comparison methods Disc drive error mapping using threshold comparison methods

1988-07-07

1990-08-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, 369 53, G01R 3312, G11B 2736

Patent

active

049490362

ABSTRACT:
An apparatus and method for testing a variety of hard disk drives is disclosed. The apparatus includes a computer connected to a control board and an interface board. The interface board is connected to a testing board. The hard disk drive is connected to the control board and testing board. The hard disk is tested by first erasing a track of data bits at full write current in one direction or polarity and second erasing the track at minimal write current in the opposite direction. The track is read and compared to a predetermined threshold and any level exceeding the threshold is considered defective.

REFERENCES:
patent: 3439343 (1969-04-01), Stahle

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