A Study of Three-Dimensional Equalization for Reproducing a Double-Layer Magnetic Recording Medium

To increase the recording density of hard disk drives (HDD), three-dimensional (3-D) magnetic recording with multiple recording layers is attracting much attention as a next-generation recording method. We have reported that the two-dimensional (2-D) partial response maximum likelihood (PRML) can ac...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-08, Vol.58 (8), p.1-4
Main Authors: Nakamura, Yasuaki, Nishikawa, Madoka, Kanai, Yasushi, Okamoto, Yoshihiro
Format: Article
Language:English
Subjects:
Bit error rate
Channels
Density
Disk drives
Equalization
Finite impulse response filters
Impulse response
Magnetic heads
Magnetic recording
Magnetic separation
Magnetism
Multiple recording layer medium
Saturation magnetization
Sensitivity
Signal to noise ratio
Three-dimensional displays
three-dimensional equalization
three-dimensional magnetic recording
Transfer functions
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Summary:To increase the recording density of hard disk drives (HDD), three-dimensional (3-D) magnetic recording with multiple recording layers is attracting much attention as a next-generation recording method. We have reported that the two-dimensional (2-D) partial response maximum likelihood (PRML) can achieve a good BER performance using the PR channel obtained from the differential-phase bit response in the 3-D magnetic recording system with a double recording layer. In this study, we realize the 3-D equalization by the 2-D finite impulse response (FIR) (2-D FIR) filter and 2-D PRML system over two layers and evaluate the 3-D equalization to further increase the recording density. The transfer function of the 2-D PR channels is determined by the response for the in-phase or differential-phase bits in a double-layer magnetic recording medium. The results show that the 2-D PRML channels with 3-D equalization based on the differential-phase transfer function achieve a good bit error rate (BER) performance for system noise.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2022.3146058