Two-dimensional magnetic recording (TDMR) by shingled magnetic recording (SMR) draws attention as a next generation technology to increase the recording density in hard disk drive (HDD). It is shown that the two-dimensional finite impulse response (2D-FIR) filter provides gain the reproducing waveforms from an array head with 3 readers in the TDMR under a specification of 4 Tbit/inch.2 We evaluate the effect of the intertrack interference (ITI) reduction by 2D-FIR using the correlation between the real FIR filter output and the partial response class-I (PR1) signal corresponding to recording sequence by the computer simulation. The results show that the 2D-FIR filter is effective to mitigate ITI and improves the signal-to-noise ratio at the discriminate point by about 0.6 dB.

Two-dimensional magnetic recording (TDMR) by shingled magnetic recording (SMR) draws attention as a technology to increase the recording densities in hard disk drive (HDD). The magnetization pattern is curved by the write field at the corner of the writer in SMR, and the information to R/W channel performance is feared. Therefore, it is possible that the bit error rate (BER) performance is improved by fitting reader sensitivity to the bit shape. In this paper, we evaluate the effect of reader sensitivity rotation in the TDMR R/W channel with head skew under a specification of 4 Tbit/inch 2 by computer simulation applying the low-density parity-check (LDPC) coding and iterative decoding system with the two-dimensional finite impulse response (TD-FIR) filter. The results show that the rotated reader sensitivity fits the recorded bit magnetization shape and the error-free skew range increases to −3 ~ 6 degrees. Therefore, the reader sensitivity rotation is considered to be an effective way to improve the skew margin in TDMR system. Index Terms-Two-dimensional magnetic recording (TDMR), Shingled magnetic recording (SMR), Reader sensitivity rotation.