Improved Data Recovery from Patterned Media With Inherent Jitter Noise Using Low-Density Parity-Check Codes

Patterned magnetic media promises areal densities in excess of 1 Tbit/in 2 for data storage. However, current imperfect patterning techniques result in a variation in the dimensions and distribution of the fabricated islands. As a result, this variation introduces jitter in the replay waveform that...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2007-10, Vol.43 (10), p.3925-3929
Main Authors: Ntokas, I.T., Nutter, P.W., Tjhai, C.J., Ahmed, M.Z.
Format: Article
Language:English
Subjects:
Bit error rate
Channels
Cross-disciplinary physics: materials science
rheology
Data recovery
Data storage
Degradation
Density
Exact sciences and technology
Fabrication
Geometry
Iterative decoding
Jitter
Lithography
Lithography jitter
low-density parity-check (LDPC) codes
Magnetic memory
Magnetism
Materials science
Media
Other topics in materials science
Parity check codes
Perpendicular magnetic recording
perpendicular patterned media
Physics
read channel performance
Waveforms
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Summary:Patterned magnetic media promises areal densities in excess of 1 Tbit/in 2 for data storage. However, current imperfect patterning techniques result in a variation in the dimensions and distribution of the fabricated islands. As a result, this variation introduces jitter in the replay waveform that makes data recovery difficult. In this paper, we investigate the use of low-density parity-check (LDPC) codes and iterative decoding for mitigating the effects of lithography jitter and improving the read channel performance in patterned media storage systems. In addition, we show that the adoption of LDPC coding techniques permits an increase in the data storage capability of the medium to approximately 1.6 Tbit/in 2 with acceptable bit-error-rate performance.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2007.903349