Position error signal estimation at high sampling rates using data and servo sector measurements

PA Ioannou, EB Kosmatopoulos… - IEEE Transactions on …, 2003 - ieeexplore.ieee.org
The sampling rate in most hard disk drives (HDDs) is limited by the number of servo burst
sectors that have prewritten position error signal (PES) data and by the spinning speed of
the HDD. The paper presents an algorithm that can generate estimates of the PES during
read at high sampling rates by processing the dedicated servo burst measurements and the
mean square error (MSE) path metric data used to choose the correct bit sequence using the
Viterbi decoding process of the read signal. The MSE metric is a nonlinear function of the …

Position error signal estimation at high sampling rates using data and servo sector measurements

PA Ioannou, EB Kosmatopoulos… - Proceedings of the 41st …, 2002 - ieeexplore.ieee.org
Track density in hard disk drives (HDD) is related to the performance characteristics of the
HDD servo control system. Higher track density can be achieved by improving the
performance characteristics of the servo controller that keeps the head close to the center of
the track. The performance of the control system however is often limited by its bandwidth.
High bandwidth implies high sampling rate. Since the sampling rate in most HDD is limited
by the number of servo burst sectors that have prewritten position error signal (PES) data …
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