TrueTrack servo technology for high TPI disk drives

The performance of a high track density disk drive is critically limited by positioning errors induced by disk shift, spindle vibration and disk warp-based servomechanics. The spectrally rich error components can be compensated for by high-gain digital filters. The filters augment the basic function...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2001-03, Vol.37 (2), p.871-876
Main Authors: SRI-JAYANTHA, Sri M, HIEN DANG, SHARMA, Arun, YONEDA, Isao, KITAZAKI, Nabuyuki, YAMAMOTO, Satoshi
Format: Article
Language:English
Subjects:
Applied sciences
Electronics
Exact sciences and technology
Magnetic devices
Other magnetic recording and storage devices (including tapes, disks, and drums)
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:The performance of a high track density disk drive is critically limited by positioning errors induced by disk shift, spindle vibration and disk warp-based servomechanics. The spectrally rich error components can be compensated for by high-gain digital filters. The filters augment the basic function of a conventional controller. Using a novel method for initializing filters, precision tracking is achieved without compromising the settle out performance of a disk drive. An autonomous filter state propagation method during seek is shown to simplify the implementation process. A silicon servo chip has been designed to incorporate the key functions of the algorithm.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.917634