Method and apparatus for detecting magnetic disk defects using a

Details Method and apparatus for detecting magnetic disk defects using a Method and apparatus for detecting magnetic disk defects using a

1993-02-16

1996-07-02

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, G01R 3312, G11B 2736

Patent

active

055325866

ABSTRACT:
In a method of the present invention, all the information is erased from a magnetic disk in a single revolution, and testing is conducted, for every track, to determine whether or not a defect is present on the magnetic disk. The apparatus includes a magnet for erasing information from the magnetic disk when the magnet is made to face the disk for a predetermined time. Subsequent to erasure the apparatus tests every disk track for defects. Test data is written onto disk tracks using a read/write head. The head is then used to obtain read signals from the data. Thresholds calculated from the read signals are used to determine if defects are present in any of the tracks.

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