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Paper Abstract and Keywords
Presentation 2026-03-06 15:20
A study of LDPC coding and iterative decoding in dual-layer HAMR
Madoka Nishikawa, Yasuaki Nakamura (Ehime Univ.), Simon Greaves (Tohoku Univ.), Yasushi Kanai (Niigata Institute of Tech.), Yoshihiro Okamoto (Ehime Univ.) MRIS2025-20
Abstract (in Japanese) (See Japanese page) 
(in English) To achieve ultra-high-density HDDs (hard disk drives), we are developing signal processing for dual-layer HAMR (head-assisted magnetic recording) with dual recording layers on one side of the HDD. In this report, we assumed an areal recording density of 2 Tbits/inch² per layer and adopted LDPC (low-density parity-check) coding and iterative decoding after 3B-2T (3 binary-2 ternary) coding. The 3B-2T code suppresses the frequency and number of “0” in the ternary sequence. Furthermore, we realize gray coding of the 3B-2T code to suppress error propagation. It is clarified that this system achieves error-free performance at an SNR (signal-to-noise ratio) of 24 dB.
Keyword (in Japanese) (See Japanese page) 
(in English) HAMR / dual-layer magnetic recording / LDPC coding and iterative decoding / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 397, MRIS2025-20, pp. 13-18, March 2026.
Paper # MRIS2025-20 
Date of Issue 2026-02-27 (MRIS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MRIS2025-20

Conference Information
Committee MRIS IEE-MAG  
Conference Date 2026-03-06 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Optical recording, Magnetic recording, and Others 
Paper Information
Registration To MRIS 
Conference Code 2026-03-MRIS-MAG 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study of LDPC coding and iterative decoding in dual-layer HAMR 
Sub Title (in English)  
Keyword(1) HAMR  
Keyword(2) dual-layer magnetic recording  
Keyword(3) LDPC coding and iterative decoding  
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1st Author's Name Madoka Nishikawa  
1st Author's Affiliation Ehime University (Ehime Univ.)
2nd Author's Name Yasuaki Nakamura  
2nd Author's Affiliation Ehime University (Ehime Univ.)
3rd Author's Name Simon Greaves  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Yasushi Kanai  
4th Author's Affiliation Niigata Institute of Technology (Niigata Institute of Tech.)
5th Author's Name Yoshihiro Okamoto  
5th Author's Affiliation Ehime University (Ehime Univ.)
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Speaker Author-1 
Date Time 2026-03-06 15:20:00 
Presentation Time 25 minutes 
Registration for MRIS 
Paper # MRIS2025-20 
Volume (vol) vol.125 
Number (no) no.397 
Page pp.13-18 
#Pages 6 
Date of Issue 2026-02-27 (MRIS) 

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