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Various properties of a vertical recording system comprising a merged MR head, a multilayer medium, and a soft magnetic underlayer were measured. SNR was found to be comparable to that of a high coercivity longitudinal disk, while nonlinearities were found to be much reduced. Measurements of nonlinear transition shift showed values less than 10% of the bit cell up to 390 kfci. Recording was performed using PR4 and EPR4 channels. Error rates below 1x10-7 could generally be obtained at low densities, which began to degrade above 300kfci. Using an EPR4 channel, an error rate of 4x10-4 was obtained at 350 kbpi at a data rate of 60 Mbits/sec.
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Lairson et al. (1997) studied this question.
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