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

概要

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The optimum magneto-resistive read-head (MR head) conditions, namely, read track width (TWR) and shield gap (G_{\text{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\text{1124kfci) and crosstalk were calculated in consideration of head noise, and optimum TWR and G_{\text{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\text{1124kfci of 14 dB, TWR can be increased to about two times track pitch for G_{\text{s}} of 15 nm. For obtaining SNR\text{1124kfci of 14 dB, TWR should be 15 nm at \sigma/D_{\text{ave}} of 5% or TWR should be 11 nm at \sigma/D_{\text{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.
2013-01-25