Method for determining an outer diameter rolloff in a process fo

Details Method for determining an outer diameter rolloff in a process fo Method for determining an outer diameter rolloff in a process fo

1994-12-19

1996-03-05

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360137, G11B 560

Patent

active

054970857

ABSTRACT:
A method is shown for testing a magnetic disk to be used in a disk drive. The method includes the steps of measuring a height profile of an outer radial edge of the disk, using the profile to determine a slope value for each of a pair of radial segments of the disk, calculating a difference value between the slope values of the pair, comparing the difference value to a preselected threshold difference value and indicating when the difference value is equal to or less than the threshold difference value. The threshold value indicates an outer most diameter of the disk where fly height operation for a head is still stable.

REFERENCES:
patent: 5168413 (1992-12-01), Coker et al.
patent: 5410439 (1995-04-01), Egbert et al.

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