Skew-Dependent Performance Evaluation of Array-Reader-Based Magnetic Recording With Dual-Reader

Array-reader-based magnetic recording (ARMR) shows potential to achieve areal density capability (ADC) beyond 1 Tb/in 2 by jointly processing multiple readback streams. Dual-reader ARMR with two read sensors and associated read channel signal processing algorithms are currently being actively invest...

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Bibliographic Details
Published in:	IEEE transactions on magnetics Vol. 51; no. 4; pp. 1 - 7
Main Authors:	Euiseok Hwang, Oenning, Travis, Mathew, George, Rahgozar, Parviz, Tedja, Suharli, Han Fang, Garfunkel, Glen, Yan Wu, Hu, David, Duquette, Paul, Fitch, Ken, Rabbitt, Chad, Petrizzi, Joseph, Wilson, Bruce, Rauschmayer, Richard
Format:	Journal Article
Language:	English
Published:	New York IEEE 01-04-2015 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Bit error rate Equalizers Joints Magnetic recording Magnetic tape Magnetism Media Performance evaluation Target tracking array-reader-based magnetic recording (ARMR) array-reader 2-D equalizer hard disk drives (HDDs) two-dimensional magnetic recording (TDMR)
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Summary:	Array-reader-based magnetic recording (ARMR) shows potential to achieve areal density capability (ADC) beyond 1 Tb/in 2 by jointly processing multiple readback streams. Dual-reader ARMR with two read sensors and associated read channel signal processing algorithms are currently being actively investigated. In this paper, dual-reader ARMR performance is evaluated focusing on skew-induced variation in cross-track separation (CTS) between the two read sensors. Spin-stand captured waveforms based evaluation is presented for the cases where a dual-reader with certain CTS and skew is emulated using captures from a single-reader at different cross-track locations as well as for the case of actual dual-reader-based captures, where the latter also accounts for head rotation. Based on bit error rate scan along cross-track under various squeezed recording and skew conditions, squeeze-to-death margin-based ADC gain of ARMR is predicted. Dual-reader ARMR shows 5%-10% ADC gain over single-reader for CTS less than 0.6 track pitch, while showing limited gains for larger CTS. Also presented is the performance evaluation of dual-reader ARMR on spin-stand using a hardware accelerated ARMR performance evaluation platform, called Stingray, which uses four Avago read channel silicon chips and a customized field programmable gate array to enable high-speed joint equalization and detection using dual-reader readback streams.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/TMAG.2014.2357774