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RESEARCH PAPERS

Air Bearing Dynamics of Sub-Ambient Pressure Sliders During Dynamic Unload

[+] Author and Article Information
Yong Hu

Quinta Corporation, 1870 Lundy Avenue, San Jose, CA 95131-1826

Paul M. Jones, Kangjie Li

Iomega Corporation, 800 Tasman Drive, Milpitas, CA 95035

J. Tribol 121(3), 553-559 (Jul 01, 1999) (7 pages) doi:10.1115/1.2834103 History: Received January 02, 1998; Revised June 10, 1998; Online January 24, 2008

Abstract

The increasing effort to use sub-ambient pressure air bearing sliders for dynamic load/unload applications in magnetic hard disk drives requires desirable air bearing characteristics during the dynamic unload event. This paper establishes air bearing design criteria for achieving a smooth head unload performance, through a correlation study between the modeled unloading air bearing dynamics of two 30 percent proximity recording sub-ambient pressure sliders and motion sequence of the same sliders by a high-speed video camera. It is shown that the air bearing lifting force quickly responds to changes in fly height and pitch, while the suction force is relatively resistant to changes in fly height, but somewhat more sensitive to changes in pitch. This unique distinction results in different decreasing rates between the air bearing lifting and suction forces during the unload process, creating a strong dependence of the unloading characteristics on the location of the suction cavities. Both the modeled unloading air bearing dynamics and experimentally recorded motion sequence illustrate that a toward-trailing-edge located suction force acts to pitch the slider up, while the moment produced by a toward-leading-edge located suction force induces a negative pitch motion, resulting in an excessive flexure deformation and dimple separation. Therefore, placing the suction cavities towards the trailing edge offers a reliable unloading performance for the sub-ambient pressure air bearing sliders.

Copyright © 1999 by Journal of Tribology
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