TY - JOUR
T1 - Optimization of Bit Geometry and Multi-Reader Geometry for Two-Dimensional Magnetic Recording
AU - Barry, John R.
AU - Vasic, Bane
AU - Khatami, Mehrdad
AU - Bahrami, Mohsen
AU - Nakamura, Yasuaki
AU - Okamoto, Yoshihiro
AU - Kanai, Yasushi
N1 - Funding Information:
This work was supported in part by Storage Research Consortium, Japan, in part by IDEMA ASTC, USA, and in part by the Directorate for Biological Sciences through the National Science Foundation under Grant CCF-1314147. The authors would like to thank R. Wood and H. Mutoh for the guidance and support
Publisher Copyright:
© 1965-2012 IEEE.
PY - 2016/2
Y1 - 2016/2
N2 - 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.
AB - 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.
KW - Two-dimensional magnetic recording
KW - data-dependent noise
KW - information theory
KW - intersymbol interference (ISI)
KW - intertrack interference (ITI)
KW - shingled magnetic recording
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U2 - 10.1109/TMAG.2015.2483593
DO - 10.1109/TMAG.2015.2483593
M3 - Article
AN - SCOPUS:84962144655
SN - 0018-9464
VL - 52
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 2
M1 - 7283623
ER -