| 摘要 |
A magnetic disk is provided wherein a non-magnetic substrate, a magnetic layer, a protection layer, and a lubrication layer are sequentially stacked. The surface of the lubrication layer has irregular structure patterns along a circumferential direction of the magnetic disk that have circumferential lengths that each correspond to a central angle. The irregular structure patterns may be formed by an adsorption between the lubrication layer and the surface of the protection layer. When a natural frequency of a magnetic head slider used to record to the magnetic disk is f and the magnetic disk rotation speed is R0, the central angle is set so as not to coincide with an angle &thetas;0 expressed by &thetas;0=360×(R0/60)/(f×1000). |
