Track density limitation for dual-layer perpendicular recording in a rigid disk environment

The authors report on the linear and track density capability of a 10-μm-wide, 31-turn inductive probe head flying at 130 to 160 nm over a dual-layer CoCrTa/NiFe disk. On-track recording results show that excellent writability is accompanied by reduced readback resolution. Off-track capability is evaluated in the presence of previously written information at a data rate of 3 Mbytes/s for a linear density of 1181 b/mm using a (2,7) code with channel equalization. The resultant off-track capability is 13% of the physical trackwidth. The implications of these test results for achievable track densities for practical files are discussed