A Multitrack Coding Scheme Designed for Perpendicular Recording Using Double Layer Medium and MR Head

Kikawada, Atsushi; Honda, N.; Ouchi, Kazuhiro

doi:10.3379/jmsjmag.21.s2_415

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The PMT head is very promising to realize multi-channel recording for hard disk drives. Although we proposed the read head design for reading signals of only two tracks together, it is easy to change the design for more mUltiple tracks as to be used a new multi-channel coding scheme design [8].…”

Section: Discussionmentioning

confidence: 99%

A New Head Design for Multi Track Perpendicular Magnetic Recording

et al. 1997

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A new head design of a planar configuration for multi track perpendicular magnetic recording is proposed. The new planar multi-track head consists 4 single-pole-type inductive write heads and 2 ring-yoke-type spin-valve MR read heads. In reproducing process, each MR head can read simultaneously signals from two tracks all together. To realize close-packed track recording, length direction of magnetic yoke of the write heads and head pole are arranged in the track and scan direction, respectively. Though this head consists of even 6 head-elements, the head fabrication process is almost the same as that of a conventional planar head. configuration has a possibility to make numerous heads simultaneously. Considering such advantages of a planar head, we propose a new head design of planar configuration for multi-track perpendicular magnetic recording. In this head structure, the signals of multi-tracks closed-packed narrow track recording can be read collectively. The detailed design and advantage of this novel head are discussed. IT. HEAD DESIGN CONCEPT A planar multi track (pMT) head consists of 4 single-pole-Key words: planar head, multi-track recording, perpendicular type (SPT) inductive write heads and 2 ring-yoke-type spinmagnetic recording, single-pole-type head, yoke-type GMR head valve (SY) MR read heads. In reproducing process, each MR head reads signals from two tracks all together. If we use

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Section: Discussionmentioning

confidence: 99%

A New Head Design for Multi Track Perpendicular Magnetic Recording

et al. 1997

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“…Advanced media, such as patterned media, together with multitrack optical transducers or magnetic recording sensors [7], [8], promise advanced systems that could implement and fully utilize 2-D recording strategies.…”

Section: Introductionmentioning

confidence: 99%

Iterative detection and decoding for separable two-dimensional intersymbol interference

O'Sullivan

Singla

et al. 2003

IEEE Trans. Magn.

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Abstract-We introduce two detection methods for uncoded two-dimensional (2-D) intersymbol interference (ISI) channels. The detection methods are suitable for a special case of 2-D ISI channels where the channel response is separable. In this case, the 2-D ISI is treated as the concatenation of two one-dimensional ISI channels. The first method uses equalization to reduce the ISI in one of the two dimensions followed by use of a maximum a posteriori (MAP) detector for the ISI in the other dimension. The second method employs modified MAP algorithms to reduce the ISI in each dimension. The implementation complexity of the two methods grows exponentially in the ISI length in either the row or column dimension. We develop two iterative decoding schemes based on these detection methods and low-density parity-check codes as error correction codes. Simulation results show that the bit-error-rate performance loss caused by the 2-D ISI for the separable channel response considered is less than 1 dB over a channel without ISI. This motivates equalizing a general 2-D ISI channel response to a nearby separable matrix.Index Terms-Equalization, iterative decoding, nonbinary MAP, turbo equalization, two-dimensional intersymbol interference.

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