Flying Height Response to Mechanical Shock During Operation of a Magnetic Hard Disk Drive

[+] Author and Article Information
Joshua C. Harrison, Michael D. Mundt

Seagate Technology, 2410 Trade Center, Longmont, CO 80503

J. Tribol 122(1), 260-263 (Jul 27, 1999) (4 pages) doi:10.1115/1.555351 History: Received February 05, 1999; Revised July 27, 1999
Copyright © 2000 by ASME
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Schematic of experimental apparatus
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Typical downward operational shock applied acceleration, and absolute disk displacement and velocity graphs
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Maximum positive apparent gram load change experienced by the head under varying operational shock conditions. Solid line includes effect of disk deflection, and dashed line is rigid disk case.
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Time history of close point flying height response to 60 g, 2 ms, downward operational shock, and the time history of the gimbal torques and effective gram load that the head experienced during that same period
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Minimum close point flying height versus operational shock excitation amplitude (all 2 ms shocks)
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Head-disk interface contact force histories predicted by Greenwood-Williamson model, in the case of 2 ms downward shocks of 30 g, 60 g, and 90 g
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Maximum head-disk interface contact pressure predicted by Greenwood-Williamson model, for all operational shock amplitudes tested



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