| 摘要 |
PROBLEM TO BE SOLVED: To enhance reproducing performance in the case of a combination of magnetic ultra-resolution reproduction and the use of violaceous laser light. SOLUTION: The surface roughness of a substrate 10 as a base face on which a recording and reproducing magnetic layer is formed or the surface roughness of a dielectric film 5 formed on the surface of the substrate is adjusted to <=0.3 nm. |
