Detection and Analysis of the Shortest Bit Missing at High Data Rate Recording

Fast response in magnetic recording systems is a continuous demand as the data rate is increasing more rapidly than ever before. Recently, we observed the phenomena that several of the shortest bits are missing in random data patterns from patterns recorded on the magnetic media. This phenomenon is assumed to be caused by the shortest bits not being recorded properly because the write field rise time and transition energy are insufficient. To easily observe this phenomenon in experiments on our spinstand, we developed a method that is based on a comparison of different data patterns. In this paper, we analyze the shortest bits missing by using a spinstand and discuss the mechanism of these bits and a testing algorithm in order to contribute to designing a recording system for high data rate performance.