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Repeatable Runout Following in Bit Patterned Media Recording
2014 Conference on Information Storage and Processing Systems, 2014 An adaptive feedforward controller design for tracking repeatable runout (RRO) in bit patterned media recording (BMPR) is proposed for single stage hard disk drives (HDD). The technique is based on a modified filtered-x least mean squares (MFX-LMS) algorithm with deterministic periodic input, and a novel variable step size that boosts both the ...
Behrooz Shahsavari +3 more
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Recording on Bit-Patterned Media at Densities of 1 Tb/in$^2$and Beyond
IEEE Transactions on Magnetics, 2006We present a comprehensive analysis of the areal density potential of a bit-patterned media recording. The recording performance is dominated by written-in errors rather than traditional signal-to-noise considerations. Written-in errors are caused by statistical fluctuations of the magnetic properties and the locations of the individual dots.
H J Richter, Olle Heinonen, P Asselin
exaly +4 more sources
The potential of bit patterned media in shingled recording
Journal of Magnetism and Magnetic Materials, 2012Abstract Shingled recording on continuous and bit patterned media (BPM) is compared. From a recording viewpoint, continuous media have the advantage due to the lack of a need to synchronise writing with dot position. For BPM the write windows at 4 Tbit/in 2 are only a couple of nm across, requiring extremely tight manufacturing tolerances.
Yasushi Kanai
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Joint-Track Equalization and Detection for Bit Patterned Media Recording
IEEE Transactions on Magnetics, 2010We compare several different detection and equalization methods for bit patterned media recording channels. We consider a scheme that utilizes a joint-track equalization technique followed by a Viterbi detector. For certain recording densities, simulation results show that it has essentially the same performance as an optimal detector but with reduced ...
Paul H Siegel, H Neal Bertram
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Prospects for bit patterned media for high-density magnetic recording
Journal of Magnetism and Magnetic Materials, 2009Abstract Prospects for bit patterned media (BPM) of more than 1 Tb/in2 are discussed. Improvement in the pattern drawing for small feature size and high precision is necessary for fabrication process. Deviation in the magnetic properties should be estimated and reduced. The etching damage seems not to be large.
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High-Density Bit Patterned Media: Magnetic Design and Recording Performance
IEEE Transactions on Magnetics, 2011 International audienceWe examine the magnetic properties and recording performance of bit patterned exchange coupled composite (ECC) magnetic media at different bit and island aspect ratios.
Olav Hellwig +2 more
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A simple recorded-bit patterning scheme for bit-patterned media recording
2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, 2013In bit-patterned magnetic recording (BPMR), intersymbol interference (ISI) and inter-track interference (ITI) become a major impairment due to small bit and track pitches. One way to alleviate ISI and ITI is to encode the data sequence before recording.
Autthasith Arrayangkool +3 more
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Recording potential of bit-patterned media
Applied Physics Letters, 2006A comprehensive analysis of the areal density potential of bit-patterned media recording shows that the recording performance is dominated by written-in errors. The statistical fluctuations of the magnetic properties and the locations of the individual bits lead to error probabilities so that some dots are either not recorded at all or cannot be ...
H. J. Richter +10 more
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Optimization of LDPC codes for bit-patterned media recording with media noise
2016 16th International Symposium on Communications and Information Technologies (ISCIT), 2016Challenges in bit-pattered magnetic recording (BPMR) include two-dimensional (2D) inter-symbol interference (ISI) constituted by both one-dimensional ISI and inter-track interference (ITI), and media noise arising from island position jitter (PJ) and island size fluctuations (SF) in both the down-track and cross-track directions.
Lingjun Kong +3 more
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Shingled Magnetic Recording on Bit Patterned Media
IEEE Transactions on Magnetics, 2010Shingled magnetic recording on bit patterned media with areal densities of 2-4 Tbit/in2 is examined. The use of a shingled recording scheme allows wider write poles and dots with higher anisotropy to be used. The down-track and cross-track write margins can be tailored to suit the tolerances of the drive by varying the bit cell aspect ratio.
Simon Greaves +2 more
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