Abstract
Digital signal evaluation for a thin-film single-pole head and double layer perpendicular disk was carrited out with an error rate tester. An AMR head was used as a reading head. The channel of the tester was the PR4ML with the 8/9 endec. Waveform for the MR head was transformed with a differentiator consisted of passive LCR circuitry and high speed linear amplifier. A D50 of 185 kFRPI, a PW50 of 130nm, and an NLTS at 300 kFRPI were measured. A byte error rate of 10^<-6> was obtained at 310 kFRPI for a read trackwidth of 1.4μm.
