2-D Decoding Algorithms and Recording Techniques for Bit Patterned Media Feasibility Demonstrations

Recording experiments and decoding algorithms are presented for evaluating the bit error rate (BER) of state-of-the-art magnetic bit-patterned media (BPM). 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 2-D bit-decoding algorithm is required. Two such algorithms are presented in detail together with the methodology implemented to accurately retrieve island positions during recording. Using these techniques, a 1.6 Td/in2magnetic BPM is demonstrated to support 2-D BER below 1e-2 under shingled magnetic recording conditions.