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Title: Feedforward control for reducing disk-flutter-induced track misregistration
Authors: Guo, G. 
Zhang, J. 
Keywords: Disk flutter
Hard disk drive
Multisensing servo
Servo control system
Vibration control
Issue Date: Jul-2003
Citation: Guo, G., Zhang, J. (2003-07). Feedforward control for reducing disk-flutter-induced track misregistration. IEEE Transactions on Magnetics 39 (4 II) : 2103-2108. ScholarBank@NUS Repository.
Abstract: We show in this paper that the disk vertical vibration signal picked from the slider in a hard disk drive has a fairly good correlation to the track misregistration at the disk flutter frequencies. We propose to introduce a feedforward controller into the usual servo loop to reduce disk-flutter-induced track misregistration (TMR). The feedforward controller is an approximated differential element with the disk vertical direction velocity as input. In our experimental setup, we show that such a method can reduce the TMR induced by the first four disk flutter modes by an average of about 56%. The method can potentially be used in high-track-per-inch servo track writers to reduce the written-in repeatable runouts.
Source Title: IEEE Transactions on Magnetics
ISSN: 00189464
DOI: 10.1109/TMAG.2003.814287
Appears in Collections:Staff Publications

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