A soft error rate track density model for MR heads

The calculation of soft error rate from models of the disk, head, and channel is used to predict optimum read and write widths for MR heads. For a 4.3 /spl mu/m track pitch, 120 kfci, and PR4 coding, the best write width is 3.8 /spl mu/m and the best read width is 2.9 /spl mu/m. The optimum write width is relatively insensitive to track misregistration and read and write width process variations. The optimum read width decreases with increasing track misregistration. The soft error rate is most sensitive to write-to-write track misregistration.