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

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.

Template-Assisted Direct Growth of 1 Td/in2 Bit Patterned Media

“…The details of our experimental setup can be found in reference. 15 On-track recording using pseudorandom bit sequences shows a bit error rate of 1e-2 when the switching of the write current polarity relative to the island locations is optimized (Fig. 5c).…”

“…14 We confirmed the high quality of the TG BPM media by performing bit error rate measurements using a drag tester with commercially available HDD heads. The details of our experimental setup can be found in ref 15. On-track recording using pseudorandom bit sequences shows a bit error rate of 1 × 10 −2 when the switching of the write current polarity relative to the island locations is optimized (Figure 5c).…”