Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1988-09-14
1990-06-05
Epstein, Henry F.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
360135, 427269, 428421, B32B 302, G11B 582
Patent
active
049313380
ABSTRACT:
A disk for testing the sliders and their supports used in rigid magnetic disk drives has at least one asperity formed of a fluorocarbon resin. Such a test disk when mounted on a spindle and rotated allows testing the mechanical performance of the sliders carrying the data transducing heads in a disk memory by flying the sliders to be tested on the test disk and observing their performance when flying over the resin asperity. A method for producing the asperity involves depositing a drop of a fluorocarbon resin solution on the area of the disk wherever an asperity is desired, drying the solution to leave a small mound of the resin where the drop was deposited, and the no curing the resin by baking. The height of an asperity can be varied by machining or by varying the concentration of the fluorocarbon resin in the solution.
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IBM Tech. Discl. Bulletin, vol. 25, No. 3A, Aug. 1982, R. W. Broome, "Calibrated Asperity Disk".
IEEE Transactions on Magnetics, vol. Mag-18, No. 6, Nov. 1982, Mackintosh et al, "A Standard Disk for Calibrating Head-Disk Interference Measuring Equipment".
IBM Tech. Discl. Bulletin, vol. 21, No. 12, May 1979, R. C. Blair et al., "Asperity Disk".
Epstein Henry F.
Heller III Edward P.
Magnetic Peripherals Inc.
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