Perpendicular recording characteristics of ring head and Co-Cr/Co-Zr-Mo double-layer media

Abstract

The read/write and noise characteristics of Co‐Cr/Co‐Zr‐Mo double‐layer media are investigated with a conventional Mn‐Zn ferrite ring head of 0.3‐μm gap length in comparison with single‐layer media. Almost the same D₅₀ recording density of 80 kFCI are obtained for both double‐ and single‐layer media with a coercivity of 500 Oe. The double‐layer media/ring head combination has superior output and overwrite characteristics but inferior noise characteristics to those of a single‐layer/ring head.