Method for inspection of magnetic disc edge roll-off

Details Method for inspection of magnetic disc edge roll-off Method for inspection of magnetic disc edge roll-off

2005-01-11

2005-01-11

Smith, Zandra V. (Department: 2877)

Optics: measuring and testing

Shape or surface configuration

C250S559220

Reexamination Certificate

active

06842257

ABSTRACT:
The invention relates to a method for testing a magnetic disc having a plurality of tracks, and apparatus for such testing. The method includes scanning the magnetic disc along radial lines, storing a sequence of data points representing slopes of a plurality of tracks along the radial lines, operating on the stored set of points to determine a measured average slope for each track around an entire revolution of each track to establish a representative slope for each of the tracks of the plurality of tracks, taking a radial moving average to establish a sequence of data points, and comparing the curvature profile to a pre-established limit to determine suitability of the disc for use in a disc drive.

REFERENCES:
patent: 5227623 (1993-07-01), Heffner
patent: 5410439 (1995-04-01), Egbert et al.
patent: 5497085 (1996-03-01), Tian et al.
patent: 6392749 (2002-05-01), Meeks et al.

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