| abstract |
Information is magnetically recorded in and reproduced from a magnetic disk using a flying magnetic head. The disk is a coating type disk comprising a rigid substrate having a magnetic layer coated thereont from a magnetic coating composition of ferromagnetic submicron particles in a binder. High density recording is possible when the substrate has a surface roughness Ra of up to 0.007 mu m, the magnetic layer has a thickness of up to 0.5 mu m, a surface roughness Ra of up to 0.005 mu m, and a porosity of 4 to 45%. |