Optimization of Bit Geometry and Multi-Reader Geometry for Two-Dimensional Magnetic Recording

John R. Barry, Bane Vasic, Mehrdad Khatami, Mohsen Bahrami, Yasuaki Nakamura, Yoshihiro Okamoto, Yasushi Kanai

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The move from traditional single-track magnetic recording to two-dimensional magnetic recording (TDMR) with squeezed tracks and multiple readers opens up new design degrees of freedom beyond the track pitch and bit-aspect ratio, including the widths, spacing, and crosstrack positions of the readers. In this paper, we present a systematic method for determining the combination of multi-reader geometry, track pitch, and bit-aspect ratio that maximizes the areal density of a TDMR system using single-track detectors. The method combines realistic modeling of the medium and write/read processes, advanced signal detection, and information-theoretic tools. For the particular head and medium we consider, the two-reader geometry that maximizes areal density with zero skew and zero misregistration was found to use different-sized readers (the smaller having a full-width at half-maximum width, i.e., 96% of the track pitch and the larger having a width, i.e., 148% of the track pitch) with significant overlap in the crosstrack direction (centers spaced by one eighth of the track pitch). The optimal bit-aspect ratio was 2.2. At the optimal operating point, the information rate per coded bit is 0.8.

Original languageEnglish (US)
Article number7283623
JournalIEEE Transactions on Magnetics
Volume52
Issue number2
DOIs
StatePublished - Feb 2016

Keywords

  • Two-dimensional magnetic recording
  • data-dependent noise
  • information theory
  • intersymbol interference (ISI)
  • intertrack interference (ITI)
  • shingled magnetic recording

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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