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A Study on the Efficacy of Airflow Mitigation Devices in Hard Disk Drives

[+] Author Affiliations
Sujit Kirpekar, David B. Bogy

University of California at Berkeley, Berkeley, CA

Paper No. WTC2005-63529, pp. 707-708; 2 pages
  • World Tribology Congress III
  • World Tribology Congress III, Volume 1
  • Washington, D.C., USA, September 12–16, 2005
  • Conference Sponsors: Tribology Division
  • ISBN: 0-7918-4201-0 | eISBN: 0-7918-3767-X
  • Copyright © 2005 by ASME


The turbulent flow of air generated by spinning disks in hard disk drives (HDD) is known to be major contributor to undesirable vibrations of the head stack assembly (HSA). The continuing demand for higher capacities in HDD has resulted in a continual increase in areal densities. Densities in excess of 100 Gb/ in2 have been demonstrated and it is widely projected that conventional technology will ultimately achieve 1 Tb/in2 . It is foreseeable that at such areal densities, a track density of 0.5 Million tracks/inch will be required, with each recorded bit being roughly 13 × 50 nm. Under such conditions, the tracking accuracy required is approximately 1.5 nm RMS (root mean square). These goals place stringent requirements on the positioning accuracy of the actuator while accentuating the need to mitigate the various sources of track misregistration (TMR).

Copyright © 2005 by ASME
Topics: Air flow , Disks



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