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Title: Spinstand demonstration of areal density enhancement using two-dimensional magnetic recording (invited)

Abstract

Exponential growth of the areal density has driven the magnetic recording industry for almost sixty years. But now areal density growth is slowing down, suggesting that current technologies are reaching their fundamental limit. The next generation of recording technologies, namely, energy-assisted writing and bit-patterned media, remains just over the horizon. Two-Dimensional Magnetic Recording (TDMR) is a promising new approach, enabling continued areal density growth with only modest changes to the heads and recording electronics. We demonstrate a first generation implementation of TDMR by using a dual-element read sensor to improve the recovery of data encoded by a conventional low-density parity-check (LDPC) channel. The signals are combined with a 2D equalizer into a single modified waveform that is decoded by a standard LDPC channel. Our detection hardware can perform simultaneous measurement of the pre- and post-combined error rate information, allowing one set of measurements to assess the absolute areal density capability of the TDMR system as well as the gain over a conventional shingled magnetic recording system with identical components. We discuss areal density measurements using this hardware and demonstrate gains exceeding five percent based on experimental dual reader components.

Authors:
; ; ; ; ; ; ; ;  [1]; ; ;  [2]; ;  [3]
  1. HGST, a Western Digital Company, San Jose, California 95119 (United States)
  2. HGST, a Western Digital Company, Rochester, Minnesota 55901 (United States)
  3. Avago Technologies, San Jose, California 95131 (United States)
Publication Date:
OSTI Identifier:
22402972
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GAIN; IMPLEMENTATION; MAGNETISM; PARITY; RECORDING SYSTEMS; SENSORS; SLOWING-DOWN; TWO-DIMENSIONAL SYSTEMS; WAVE FORMS

Citation Formats

Lippman, Thomas, E-mail: Thomas.Lippman@hgst.com, Brockie, Richard, Contreras, John, Garzon, Samir, Leong, Tom, Marley, Arley, Wood, Roger, Zakai, Rehan, Zolla, Howard, Coker, Jon, Galbraith, Rick, Hanson, Weldon, Duquette, Paul, and Petrizzi, Joe. Spinstand demonstration of areal density enhancement using two-dimensional magnetic recording (invited). United States: N. p., 2015. Web. doi:10.1063/1.4914051.
Lippman, Thomas, E-mail: Thomas.Lippman@hgst.com, Brockie, Richard, Contreras, John, Garzon, Samir, Leong, Tom, Marley, Arley, Wood, Roger, Zakai, Rehan, Zolla, Howard, Coker, Jon, Galbraith, Rick, Hanson, Weldon, Duquette, Paul, & Petrizzi, Joe. Spinstand demonstration of areal density enhancement using two-dimensional magnetic recording (invited). United States. doi:10.1063/1.4914051.
Lippman, Thomas, E-mail: Thomas.Lippman@hgst.com, Brockie, Richard, Contreras, John, Garzon, Samir, Leong, Tom, Marley, Arley, Wood, Roger, Zakai, Rehan, Zolla, Howard, Coker, Jon, Galbraith, Rick, Hanson, Weldon, Duquette, Paul, and Petrizzi, Joe. Thu . "Spinstand demonstration of areal density enhancement using two-dimensional magnetic recording (invited)". United States. doi:10.1063/1.4914051.
@article{osti_22402972,
title = {Spinstand demonstration of areal density enhancement using two-dimensional magnetic recording (invited)},
author = {Lippman, Thomas, E-mail: Thomas.Lippman@hgst.com and Brockie, Richard and Contreras, John and Garzon, Samir and Leong, Tom and Marley, Arley and Wood, Roger and Zakai, Rehan and Zolla, Howard and Coker, Jon and Galbraith, Rick and Hanson, Weldon and Duquette, Paul and Petrizzi, Joe},
abstractNote = {Exponential growth of the areal density has driven the magnetic recording industry for almost sixty years. But now areal density growth is slowing down, suggesting that current technologies are reaching their fundamental limit. The next generation of recording technologies, namely, energy-assisted writing and bit-patterned media, remains just over the horizon. Two-Dimensional Magnetic Recording (TDMR) is a promising new approach, enabling continued areal density growth with only modest changes to the heads and recording electronics. We demonstrate a first generation implementation of TDMR by using a dual-element read sensor to improve the recovery of data encoded by a conventional low-density parity-check (LDPC) channel. The signals are combined with a 2D equalizer into a single modified waveform that is decoded by a standard LDPC channel. Our detection hardware can perform simultaneous measurement of the pre- and post-combined error rate information, allowing one set of measurements to assess the absolute areal density capability of the TDMR system as well as the gain over a conventional shingled magnetic recording system with identical components. We discuss areal density measurements using this hardware and demonstrate gains exceeding five percent based on experimental dual reader components.},
doi = {10.1063/1.4914051},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}