Quality inspecting method and apparatus for detecting defects in

Details Quality inspecting method and apparatus for detecting defects in Quality inspecting method and apparatus for detecting defects in

1991-07-16

1993-10-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

369 58, G01R 3312, G01N 2782

Patent

active

052569659

ABSTRACT:
A magnetic disk inspection apparatus for recording and reproducing inspection signals onto and from each track on a magnetic disk, in which the inspection signals are recorded and reproduced automatically without a manual operation onto and from the magnetic disk, the maximum value is detected from the reproduction signals on the basis of the sampling signal, the average value of the maximum values is calculated for each sector, the difference between the average values in the same sector number of the adjacent tracks is determined, the change ratio based on this difference is calculated and quality of the magnetic disk is judged on the basis of this change ratio.

REFERENCES:
patent: 3686682 (1972-08-01), Behr et al.

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