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Off-track detection based on the readback signals in magnetic recording
Author(s)
Date Issued
October 29, 2012
Type
Article
Abstract
Off-track condition in magnetic recording systems degrades the system performance. It is typically detected and adjusted by the servo control loop. In this work, we propose an off-track detection based on the readback signals and improve the bit error performance using an asymmetric target depending on the detected off-track direction. Specifically, we investigate the effects of off-track events on the target-shaping equalizer coefficients when the generalized partial-response target (GPR) is fixed. For a 3 × 3 channel matrix of bit patterned media recording (BPMR) system, the asymmetric targets offer the gain of about 1 to 2 dB at BER = 10 -4 for the TMR level of 20% to 25%. © 2012 IEEE.
Citation
IEEE Transactions on Magnetics, 48(11), 4590-4593, 2012