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

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4914051· OSTI ID:22402972

Lippman, Thomas; Brockie, Richard; Contreras, John; Garzon, Samir; Leong, Tom; Marley, Arley; Wood, Roger; Zakai, Rehan; Zolla, Howard ^[1]; Coker, Jon; Galbraith, Rick; Hanson, Weldon ^[2]; Duquette, Paul; Petrizzi, Joe ^[3]

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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)

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.

• OSTI ID: 22402972
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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