Method of inspecting magnetic disks for surface defects

Details Method of inspecting magnetic disks for surface defects Method of inspecting magnetic disks for surface defects

1987-02-12

1989-05-09

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, G01R 3312, G01N 2782, G11B 584

Patent

active

048292494

ABSTRACT:
A method of inspecting surface defects in a magnetic disk. First, a predetermined inspection signal is recorded on a randomly selected track of the magnetic disk during a first rotation of the disk. Second, during a second rotation of the disk, the inspection signal is read and a read signal is produced. Then, during a third rotation of the disk, the value of the read signal is compared with a reference value to determine whether any surface defect exists, and a seek operation is performed to move to the next track of the magnetic disk which is inspected. During one of the second and third rotations of the disk, the read signal is used to set a new reference value to be used in a surface defect inspection of a new track to be inspected.

REFERENCES:
pp. 15-16 of the 9th Draft (Dated Sep. 1, 1984), of the "Proposed American National Standard-Unformated Flexible Carriage . . . ", Prepared by ISO.

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