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Title: Digital position error signal generation in magnetic disk drives
Authors: WONG WAI EE
Keywords: Hard Disk Drives (HDD), Position Error Signal (PES), Servo Pattern, Servo Demodulation, Servo Control System, Servo Signal Processing
Issue Date: 5-Feb-2004
Citation: WONG WAI EE (2004-02-05). Digital position error signal generation in magnetic disk drives. ScholarBank@NUS Repository.
Abstract: With the growing demands for higher magnetic recording density, data is recorded in an ever-narrow track that must be followed with extreme precision. Given the importance of improving the quality of position error signal (PES), this thesis studies the different position encoding and digital decoding schemes to achieve precise position measurement for servo control in ultra-high track density. A combined frequency-encoded and DFT-based demodulation scheme is proposed to replace the existing servo technology, which allows a reduction of servo overhead, better noise immunity, increases efficiency and accuracy. The proposed scheme is also implemented and used as the feedback signal for real-time servo control on a spin stand for demonstration of higher TPI capabilities. A new track mis-registration detection strategy through estimation of head position from frequency-encoded user data channel is also proposed to increase measurement accuracy and position sampling rate, particularly for embedded servo system.
Appears in Collections:Master's Theses (Open)

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