Two-dimensional Decoding Algorithms and Recording Techniques for Bit Patterned Media Feasibility Demonstrations

TL;DR

This paper presents new two-dimensional decoding algorithms and recording techniques for magnetic bit patterned media, demonstrating low bit-error rates at high recording densities using conventional hardware.

Contribution

It introduces two novel 2D decoding algorithms and a methodology for accurately retrieving island positions, advancing magnetic recording technology.

Findings

Achieved 2D bit error rates below 1e-2 at 1.6 Td/in² density.

Demonstrated feasibility of high-density magnetic media with conventional heads.

Developed accurate position retrieval methodology for recording experiments.

Abstract

Recording experiments and decoding algorithms are presented for evaluating the bit-error-rate of state-of-the-art magnetic bitpatterned media. The recording experiments are performed with a static tester and conventional hard-disk-drive heads. As the reader dimensions are larger than the bit dimensions in both the down-track and the cross-track directions, a two-dimensional bit decoding algorithm is required. Two such algorithms are presented in details together with the methodology implemented to accurately retrieve island positions during recording. Using these techniques, a 1.6 Td/in$^2$ magnetic bit pattern media is demonstrated to support 2D bit error rates below 1e-2 under shingled magnetic recording conditions.