Technical Briefs

Flying Clearance Distribution With Thermal Flying Height Control in Hard Disk Drives

[+] Author and Article Information
Sung-Chang Lee1

 Samsung Information Systems America, 75 West Plumeria Drive, San Jose, CA 95134sungc.lee@samsung.com

George W. Tyndall

 Samsung Information Systems America, 75 West Plumeria Drive, San Jose, CA 95134george.tyndall@wdc.com

Mike Suk

 Samsung Information Systems America, 75 West Plumeria Drive, San Jose, CA 95134mike.suk@samsung.com


Corresponding author.

J. Tribol 132(2), 024502 (Mar 24, 2010) (4 pages) doi:10.1115/1.4001024 History: Received July 19, 2009; Revised January 08, 2010; Published March 24, 2010; Online March 24, 2010

Flying clearance distribution with thermal flying height control (or thermomechanical actuation) is characterized. Especially, factors contributing to variation in the flying clearance are identified based on the flying height change profiles taken from the burn-in process of hard disk drives and Gage R&R (repeatability and reproducibility) test of touch down repeatability. In addition, the effect of static temperature compensation scheme on the flying clearance distribution is investigated, and the disadvantage of static adaptation to temperature change is identified. In order to avoid early catastrophic head-disk interface failures due to poor static temperature compensation, dynamic clearance adjustment is necessary whenever environmental condition changes. Otherwise, static temperature compensation using the individual temperature sensitivity values of each head needs to be applied.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

TFC and the corresponding head-media spacing change

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Figure 2

Definition of the flying clearance, target clearance, adjusted clearance, and clearance distribution

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Figure 3

FH change profile with TFC actuation taken from burn-in (or self-diagnosing) process of the HDD (experiment)

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Figure 4

Maximum flying clearance distribution change with temperature (experiment)

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Figure 5

Clearance distribution after static TFC adjustment with temperature; target clearance is 5.0 nm; (a), (c), and (d) are predictions (or simulations); 1σ is the standard deviation of the clearance distribution




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