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Advances in Tribology
Volume 2012 (2012), Article ID 964089, 7 pages
Research Article

Low Molecular Weight Z-Tetraol Boundary Lubricant Films in Hard Disk Drives

Media Development, HGST Western Digital, 5601 Great Oaks Parkway, San Jose, CA 95119-1003, USA

Received 16 August 2012; Accepted 5 November 2012

Academic Editor: Bruno Marchon

Copyright © 2012 R. J. Waltman and H. Deng. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Lower molecular weight Z-Tetraol films exhibit increased mechanical spacing in the slider-disk interface due to a lower z-profile. An increased resistance to lubricant disturbance on the disk surface (e.g., lube moguls) with decreasing film thickness is attributed to an increasing contribution from the polar component of the disjoining pressure. Evaporative loss at temperatures typically encountered in a hard-disk drive also increases with decreasing molecular weight but is strongly dependent on the initial bonded fraction.