EXTERNAL CLOCKING PRML MAGNETIC RECORDING CHANNEL FOR DISCRETE TRACK MEDIA

A novel external clocking magnetic disk recording channel is proposed and examined. Timing not only for data recovery but for recording is g iven by a bit clock which is synchronized with dedicated clock marks o n patterned discrete track media. Jitter of the bit clock is 2.5 ns(rm s), which is good enough for data rates up to about 20 Mbit/s. Using a n MR/Inductive head and PRML (Partial Response Maximum Likelihood) sig nal processing, an error rate of 1 X 10(-6) is obtained at linear dens ity 3146 bit/mm.