An Effective Track Width with a 2D Modulation Code in Two-Dimensional Magnetic Recording (TDMR) Systems

Kotchakorn PITUSO  Chanon WARISARN  Damrongsak TONGSOMPORN  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.11   pp.839-844
Publication Date: 2019/11/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018ECP5036
Type of Manuscript: PAPER
Category: Storage Technology
Keyword: 
two-dimensional magnetic recording (TDMR),  2D modulation code,  intertrack interference (ITI),  

Full Text: FreePDF(1.4MB)


Summary: 
When the track density of two-dimensional magnetic recording (TDMR) systems is increased, intertrack interference (ITI) inevitably grows, resulting in the extreme degradation of an overall system performance. In this work, we present coding, writing, and reading techniques which allow TDMR systems with multi-readers to overcome severe ITI. A rate-5/6 two-dimensional (2D) modulation code is adopted to protect middle-track data from ITI based on cross-track data dependence. Since the rate-5/6 2D modulation code greatly improves the reliability of the middle-track, there is a bit-error rate gap between middle-track and sidetracks. Therefore, we propose the different track width writing technique to optimize the reliability of all three data tracks. In addition, we also evaluate the TDMR system performance using an user areal density capability (UADC) as a main key parameter. Here, an areal density capability (ADC) can be measured by finding the bit-error rate of the system with sweeping track and linear densities. The UADC is then obtained by removing redundancy from the ADC. Simulation results show that a system with our proposed techniques gains the UADC of about 4.66% over the conventional TDMR systems.