Servo-write quality and servo performance in perpendicular recording

摘要

Perpendicular recording has recently been replacing longitudinal recording in hard disk drives (HDDs). With perpendicular recording, however, it has been clarified that a state of DC magnetization is not conducive for read and write operations because it causes a unique flux flaw. In this paper, we investigated servo-write quality and servo performance, and found that the erasing conditions strongly affected the self-servo-write quality, which was especially seen in the reading process.