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

The optimum magneto-resistive read-head (MR head) conditions, namely, read track width (TWR) and shield gap (G sub(s)), with a bit-patterned medium (BPM) for areal recording density of 5.8 Tbit/in. super(2) were determined by analytical calculation. Signal-to-noise ratio at a linear recording density of 1124 kfci (SNR sub(1124kfci)) and crosstalk were calculated in consideration of head noise, and optimum TWR and G sub(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 super(-3) and SNR sub(1124kfci) of 14 dB, TWR can be increased to about two times track pitch for G sub(s) of 15 nm. For obtaining SNR sub(1124kfci) of 14 dB, TWR should be 15nm at [sigma]/D sub(ave) of 5% or TWR should be 11nm at [sigma]/D sub(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. super(2).