Defect Detection and Burst Erasure Correction for TDMR

Matcha, Chaitanya Kumar and Srinivasa, Shayan Garani (2016) Defect Detection and Burst Erasure Correction for TDMR. In: IEEE TRANSACTIONS ON MAGNETICS, 52 (11).

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Abstract

Media defects are common in magnetic recording, resulting in the bursts of erasures. The use of error correcting codes can be aided by a defect detector for indicating the location of erasures. In this paper, we propose a model to study 2-D media defects that can occur in 2-D magnetic recording ( TDMR). We also propose a novel defect identification and detection algorithm to identify the location of defects by the magnitude thresholding of the readback samples and identifying defective data patterns at the output of a 2-D signal detector. The defect detector identifies a 2-D edge-connected region of defects for burst erasure correction. Using simulations, we show that the defect detector can be designed to identify the location of 2-D defects with > 90% accuracy for deep defects. The effect of the defect detector in TDMR is studied over a Voronoi-based media model where low density parity check ( LDPC) codes are used for error correction. The defect detector is observed to achieve > 2 dB gain in signal-to-noise ratio ( SNR) for a 38x38 burst erasure. We also study simple interleaving schemes for LDPC codes that give a further gain of > 0.3 dB in SNR and can correct 76 x 76 and larger burst erasures.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON MAGNETICS
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	03 Dec 2016 10:06
Last Modified:	03 Dec 2016 10:06
URI:	http://eprints.iisc.ac.in/id/eprint/55397

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