Hitachi, Ltd.

Keigo Iechika

Hiroyuki Suzuki

Akira Kato

Yoshiki Kato

Masaki Ohura

Youichi Kawakubo

Mikio Takada

Fuzio Maeda

Masa-aki Imamura

Eiichi Takasuna

Shyuichi Kojima

A disk-type recording medium having a circular substrate on which a recording layer is formed does not include any through hole formed in the center of rotation. Since no through hole is formed, it is possible to improve the reliability of the medium with regard to its strength, and to reduce the thickness of the substrate. Further, it is possible to render the thickness of the recording coating uniform.

Disk-type recording medium and storage apparatus

A magnetic recording medium of the present invention comprises: a substrate; a magnetic film formed on this substrate; and a nonmagnetic reinforcing agent mixed into the magnetic film and projected from the surface of the magnetic film. Assuming that the minimum flying height of the magnetic head which is lifted up over the magnetic film is h, a projection height T of the nonmagnetic reinforcing agent from the surface of the magnetic film satisfies the relation of h/4&lt;T&lt;h. By virtue of this, even if an amount of mixture of the nonmagnetic reinforcing agent which becomes a cause of the generation of the noises is reduced, the necessary durability can be obtained.

Magnetic recording medium

Growing community of inventors

Odawara, Japan

Keigo Iechika