A Two-Dimensional Code for Bit Patterned Magnetic Recording Channel

Abstract

In this paper, a two-dimensional (2-D) channel code for magnetic patterned media is proposed. Patterned media records an information bit on a magnetized dot. Since the space between adjacent tracks is narrow in order to increase the storage density, inter-track interference (ITI) and inter-symbol interference (ISI) can be problems. The amplitude of a bit signal can be corrupted by the 2-D ISI. The signal of the bit surrounded by the same value can be especially destructive, i.e. when its value is the same as the values of the eight surrounding bits. The proposed modulation coding scheme improves the decoding performance of patterned media by preventing this worst case and provides a better code rate than conventional channel codes.

Performance Evaluation of Skewed Read-Head for Shingled Magnetic Recording

“…If the head is skewed, it is possible to complement the performance by positioning the two heads at the center of the current track. Interference, ITI) 역시 심각한 문제가 되었다 [1][2][3][4][5][6][7][8][9][10][11] .자기기록 장치에서 리드헤드가 트랙을 따라 돌면서 데이터를 읽을 때, 물리적인 영향으로 리드헤드가 방 향이 틀어 질 수 있다 [12,13] . 그림 1은 이러한 경우를 그림으로 나타냈다.…”