The effect of head-disk impacts due to repeated dynamic load is investigated experimentally. Loading conditions more severe than those typically found in ramp-load disk drives are applied to ensure that contacts occur, and disk-synchronized head loading motions are applied so that the head-disk contact points are all distributed within a small area on the disk. The resulting readback signal decrease was observed to correlate with the head-disk impact velocity and hence the slider’s vertical approaching velocity. With a larger vertical velocity, readback signal decrease appeared earlier and the amount of decrease was larger. The results indicate that dynamic load-unload should be quite reliable under typical loading conditions, and the reliability of dynamic load-unload can be achieved by controlling the vertical approaching velocity of the slider. This is comparatively easier than controlling the narrow manufacturing tolerances of the slider’s pitch and roll of the head-suspension assembly. The technological trend toward using smaller-sized head-suspension assemblies and higher-coercivity magnetic disks may further enhance the dynamic load head-disk interface durability.
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April 1996
Research Papers
Readback Signal Decrease Due to Dynamic Load Head-Disk Contacts
Ta-Chang Fu,
Ta-Chang Fu
Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720
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D. B. Bogy
D. B. Bogy
Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720
Search for other works by this author on:
Ta-Chang Fu
Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720
D. B. Bogy
Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720
J. Tribol. Apr 1996, 118(2): 370-375 (6 pages)
Published Online: April 1, 1996
Article history
Received:
March 2, 1995
Revised:
June 28, 1995
Online:
January 24, 2008
Citation
Fu, T., and Bogy, D. B. (April 1, 1996). "Readback Signal Decrease Due to Dynamic Load Head-Disk Contacts." ASME. J. Tribol. April 1996; 118(2): 370–375. https://doi.org/10.1115/1.2831311
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