To achieve an areal density approaching 50 Gb/in.2 for the magnetic storage of data in hard disk drives requires reduced mechanical and magnetic spacing. Off-track jitter caused by airflow or contact can cause track misregistration on the order of 20–70 nm which may be excessive for adequate servo performance. The magnetic signal can be used to identify both the vertical spacing modulation due to the air bearing modes and off-track jitter due to suspension modes with nanometer resolution. We find that the off-track jitter in the flying regime is driven by airflow and is a strong function of the disk velocity and the suspension type. In the contact regime, the vertical spacing modulation and off-track jitter increase due to contact. Using a laser Doppler vibrometer we identified the leading contribution to the off-track jitter to be primarily the first torsional mode (T1) and to a lesser extent the first bending mode (B1) of the suspension.
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July 2001
Technical Papers
Head-Disk Dynamics in the Flying, Near Contact, and Contact Regimes
Run-Han Wang,
Run-Han Wang
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
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Vasant Nayak,
Vasant Nayak
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
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Fu-Ying Huang,
Fu-Ying Huang
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
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Wade Tang,
Wade Tang
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
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Francis Lee
Francis Lee
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
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Run-Han Wang
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Vasant Nayak
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Fu-Ying Huang
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Wade Tang
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Francis Lee
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120
Contributed by the Tribology Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for presentation at the STLE/ASME Tribology Conference, Seattle, WA, October 1–4. Manuscript received by the Tribology Division February 17, 2000; revised manuscript received July 6, 2000. Paper No. 2000-TR1B-37. Associate Editor. J. L. Streator.
J. Tribol. Jul 2001, 123(3): 561-565 (5 pages)
Published Online: July 6, 2000
Article history
Received:
February 17, 2000
Revised:
July 6, 2000
Citation
Wang , R., Nayak , V., Huang , F., Tang , W., and Lee, F. (July 6, 2000). "Head-Disk Dynamics in the Flying, Near Contact, and Contact Regimes ." ASME. J. Tribol. July 2001; 123(3): 561–565. https://doi.org/10.1115/1.1308037
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