A two-dimensional coding design for staggered islands bit-patterned media recording

Abstract

This paper proposes a two dimensional (2D) staggered recorded-bit patterning (SRBP) coding scheme for staggered array bit-patterned media recording channel to alleviate the severe 2D interference, which requires no redundant bits at the expense of increased an additional memories. Specifically, a data sequence is first split into three tracks. Then, each data track is circularly shifted to find the best data pattern based on a look-up table before recording such that the shifted data tracks cause the lowest 2D interference in the readback signal. Simulation results indicate that the system with our proposed SRBP scheme outperforms that without any 2D coding, especially when an areal density (AD) is high and/or the position jitter is large. Specifically, for the system without position jitter at bit-error rate of 10−4, the proposed scheme can provide about 1.8 and 2.3 dB gains at the AD of 2.5 and 3.0 Tb/in.2, respectively.

Investigation of writing error in staggered heated-dot magnetic recording systems

“…Results show that the magnetization states (or magnetic field) of the surrounding islands must be taken into account when designing the two-dimensional (2D) modulation code 30 to avoid the bad data patterns to be recorded onto a medium. It can also be concluded that the staggered island arrangement helps improve the error performance of the HDMR system, 31 if compared to the square island arrangement.…”