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TECHNICAL PAPERS

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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References

Kouhei,  T., Yamada,  T., Kuroba,  Y., and Aruga,  K., 1995, “A Study of Head-Disk Interface Shock Resistance,” IEEE Trans. Magn., 31, No. 6, pp. 3006–3008.
White,  R. L., Schreck,  E., and Wang,  R-H., 1996, “Nanoindentation and the Tribology of Head-Disk Interface Components,” IEEE Trans. Magn., 32, No. 1, pp. 110–114.
Ishimaru,  N., 1996, “Experimental Studies of a Head/Disk Interface Subjected to Impulsive Excitation During Nonoperation,” ASME J. Tribol., 118, pp. 807–812.
Ohwe,  T., Watanabe,  T., Yoneoka,  S., and Mizoshita,  Y., 1996, “A New Integrated Suspension for Pico-Sliders (PICO-CAPS),” IEEE Trans. Magn., 32, No. 5, pp. 3648–3650.
Cha,  E., and Bogy,  D. B., 1995, “A Numerical Scheme for Static and Dynamic Simulation of Sub-ambient Pressure Shaped Rail Sliders,” ASME J. Tribol., 117, pp. 36–46.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York.
Allen,  A. M., and Bogy,  D. B., 1996, “Effects of Shock on the Head-Disk Interface,” IEEE Trans. Magn., 32, No. 5, pp. 3717–3719.
Marek, S., 1995, “Shock Testing of Head Gimbal Assemblies,” Asia-Pacific Magnetic Recording Conference, paper WB-01-2, Singapore.
Suzuki,  S., and Nishihira,  H., 1996, “Study of Slider Dynamics Over Very Smooth Magnetic Disks,” ASME J. Tribol., 118, pp. 382–387.

Figures

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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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