A Study on Optimal BAR in Array Head Reading

T. Kondoh, Y. Nakamura, M. Nishikawa, H. Osawa, Y. Okamoto, Y. Kanai, H. Muraoka

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Two-dimensional magnetic recording (TDMR), which combines shingled magnetic recording (SMR) with 2-D signal processing attracts attention from the hard disk drive industry. SMR is a magnetic recording system in order to increase the track density by writing tracks without the guard band. Therefore, the influences of writing and reading intertrack interferences (ITIs) deteriorate the quality of reproducing waveforms. Additionally, degradation of track due to overwriting and crosstalk from the adjacent tracks due to the width of reader sensitivity. The equalization using 2-D finite impulse response filter for the waveforms from three adjacent tracks is proposed as a method to reduce the influence of reading ITIs. In this paper, we evaluate the bit aspect ratio (BAR) in TDMR read/write channel under a specification of 4 Tb/in2 using bit error rate of the low-density parity-check (LDPC) coding and iterative decoding system obtained by computer simulation. The results show that the suitable BAR in array head reading is 2.0.

Original languageEnglish
Article number7920410
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2017 Nov


  • Array head reading
  • bit aspect ratio (BAR)
  • low-density parity-check (LDPC) code
  • shingled magnetic recording (SMR)

ASJC Scopus subject areas

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


Dive into the research topics of 'A Study on Optimal BAR in Array Head Reading'. Together they form a unique fingerprint.

Cite this