Servo bandwidth and positioning accuracy design for high track density disk drives

Possibility of achieving positioning accuracy to meet the areal density of 40 Gb/in/sup 2/ has been studied. Stationary and nonstationary position errors are shown, and the servo design approaches have been proposed. A precise model of head-positioning system has been developed, and the required ope...

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Veröffentlicht in:IEEE transactions on magnetics 2000-09, Vol.36 (5), p.2216-2218
Hauptverfasser: Yamaguchi, T., Usui, K., Okuyama, A., Yasuna, K., Akagi, K., Shishida, K.
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Sprache:eng
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Zusammenfassung:Possibility of achieving positioning accuracy to meet the areal density of 40 Gb/in/sup 2/ has been studied. Stationary and nonstationary position errors are shown, and the servo design approaches have been proposed. A precise model of head-positioning system has been developed, and the required open loop servo bandwidth is estimated using the model. The experimental results using 2.5-inch HDD show that 750 Hz to 1 kHz servo bandwidth (open loop crossover frequency) is effective to achieve 40 nm positioning accuracy during track-following to meet 60 kTPI for 40 Gb/in/sup 2/.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.908364