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 |
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Format: | Artikel |
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/. |
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ISSN: | 0018-9464 1941-0069 |
DOI: | 10.1109/20.908364 |