Magnetic disk
AssigneeTDK Corporation
InventorsKeiji Koga, Jun-ichi Satoh, Kenji Yokoyama, Akinori Nisizawa, Yasumichi Tokuoka
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Abstract
A magnetic disk suitable for high density recording and reproduction of information wherein said disk is a coating type disk comprising a rigid substrate having a magnetic layer coated thereon from a magnetic coating composition of ferromagnetic submicron particles in a binder, wherein 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%.
Claims3
A magnetic disk comprising a rigid substrate and a magnetic layer formed thereon by coating a magnetic coating composition containing magnetic submicron particles, wherein
- the substrate has a surface roughness Ra of up to 0.007 .mu.m, and
- 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%.
Dependencies are inferred from the claim text.