| 摘要 |
A magnetic disk comprises a support, a substantially non-magnetic lower layer, and a magnetic layer containing at least one of a ferromagnetic metal powder and a hexagonal ferrite powder and a binder, wherein the magnetic layer has a thickness of 0.02 mum to 0.5 mum, a surface having a ten-point mean height Rz measured by a non-contact surface roughness profiler of 20 nm to 50 nm, and a number of projections having a height of at least 20 nm measured by AFM of 1x105/mm2 to 2x106/mm2.
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