Theoretical Prediction of Ramp Loading/Unloading Process in Hard Disk Drives

[+] Author and Article Information
J. P. Peng

Western Digital Corporation, 5863 Rue Ferrari, San Jose, CA 95138

J. Tribol 121(3), 568-574 (Jul 01, 1999) (7 pages) doi:10.1115/1.2834105 History: Received January 23, 1998; Revised June 10, 1998; Online January 24, 2008


Air bearing slider dynamic performance during the ramp loading and unloading processes was investigated theoretically in this paper. The air bearing was modeled by the modifiedcompressible Reynolds equation, and it was solved by the finite volume method. Slider dynamic equations were derived in this paper to include the ramp loading/unloading mechanism. These two sets of coupled equations were solved iteratively. Both Tripad and negative pressure air bearing (NPAB) were included in the analysis. Effects of loading/unloading velocity, disk rotational speed, as well as suspension flexure stiffness, were investigated. Slider-disk impact will occur during the Tripad loading process, especially at high loading velocity. On the other hand, this impact can be avoided for an NPAB at loading velocity up to 200 mm/s. However, an NPAB requires a longer unloading time due to its suction force. This unloading process is further delayed if a soft flexure is combined with an NPAB.

Copyright © 1999 by Journal of Tribology
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