Read-head Conditions for Obtaining Areal Recording Density of 5.8 Tbit/in. 2 on a Bit-Patterned Medium

The optimum magneto-resistive read-head (MR head) conditions, namely, read track width (TWR) and shield gap ( G s ), with a bit-patterned medium (BPM) for areal recording density of 5.8 Tbit/in. 2 were determined by analytical calculation. Signal-to-noise ratio at a linear recording density of 1124 kfci (SNR 1124kfci ) and crosstalk were calculated in consideration of head noise, and optimum TWR and G s were obtained from the calculation results. The effect of intertrack interference cancellation (ITIC) was investigated by using a signal-processing simulator. The investigation shows that intertrack interference cancellation decreases bit error rate. Moreover, to obtain bit error rate of 10 -3 and SNR 1124kfci of 14 dB, TWR can be increased to about two times track pitch for G s of 15 nm. For obtaining SNR 1124kfci of 14 dB, TWR should be 15 nm at σ/ D ave of 5% or TWR should be 11 nm at σ/ D ave of 10%. These results demonstrate that ITIC effectively decreases bit error rate and thus contributes to attaining areal recording density of 5.8 Tbit/in. 2 .