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TrueTrack/sup TM/ servo technology for high TPI disk drives
2001 / IEEE
This item was taken from the IEEE Periodical ' TrueTrack/sup TM/ 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 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.
Truetrack Servo System
Hard Disk Drive
Position Error Signal
Autonomous State Propagation
Power Harmonic Filters
Algorithm Design And Analysis
Fields, Waves And Electromagnetics