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Author: search.filters.author.Kovintavewat, PiyaSubject: search.filters.subject.Information storage

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    An Intertrack Interference Subtraction Scheme for a Rate-4/5 Modulation Code for Two-Dimensional Magnetic Recording
    (2016-01-01)
    Pituso, Kotchakorn
    ;
    Warisarn, Chanon
    ;
    Tongsomporn, Damrongsak
    ;
    Kovintavewat, Piya
    The performance of a rate-4/5 modulation code is evaluated in two-dimensional magnetic recording (TDMR) channels, where a magnetic medium is described by a discrete Voronoi model, and the two-dimensional sensitivity function of the reader is adopted to generate the TDMR readback signal. Since the read-head sensitivity function covers many tracks, it causes intertrack interference (ITI) that can deteriorate the system performance. Therefore, this letter proposes an ITI subtraction scheme in conjunction with the rate-4/5 modulation code in a coded TDMR channel to mitigate the ITI effect embedded in the readback signals before performing an iterative decoding process. We also investigate the data-dependent readback amplitude distributions and evaluate the TDMR system performance via computer simulation. Results show that the proposed scheme helps improve the TDMR system performance, especially when the areal density is high.
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    Effects of Island Volume and Hotspot Position Fluctuation for Heated-Dot Magnetic Recording
    (2016-01-01)
    Tipcharoen, Warunee
    ;
    Warisarn, Chanon
    ;
    Kovintavewat, Piya
    Heated-dot magnetic recording (HDMR), which employs the laser to heat a bit-patterned medium before recording data, is a promising technology to achieve an ultra-high recording density. Generally, many parameters can cause an error during the writing process in an HDMR system; however, this letter investigates only the effect of bit island volume, bit island position fluctuation, and hotspot position fluctuation. Specifically, three bit island volumes are considered, i.e., 1100, 860, and 620 nm<sup>3</sup>. In addition, we also study the 3-by-3 data patterns that easily cause an error when the hotspot and write head positions have fluctuated. To achieve an error-free writing process, the heating temperature is studied using the Brillouin function for thermal calculations. Implementation of treating the hotspot and evaluating the thermal effect is explicitly described. Simulation results indicate that the smaller the position variation, the lower the error percentage. Moreover, we found that the error percentage is decreased as the heating temperature is increased. Finally, it is apparent that the smaller the island volume, the lower the error percentage.