Hitachi, Ltd.

Shyuichi Kojima

Hiroyuki Suzuki

Yoshihiro Shiroishi

Akira Kato

Kazuetsu Yoshida

Masaki Ohura

Hajime Aoi

Sadao Hishiyama

Tomoyuki Ohno

Susumu Funamoto

Yasushi Kitazaki

Mikio Takada

Sakae Ohta

Keigo Iechika

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

Disclosed is a magnetic recording medium of the magnetic metal thin-film type for longitudinal recording, in which the noise is reduced by selecting the value of maximum torque L (the product of magnetic anisotropy energy Ku and magnetic layer volume v; as measured by setting the axis of rotation in plane of the medium) and the value of magnetic flux .phi. (the product of saturation magnetization Ms and magnetic layer volume v) from a range defined by 0&lt;L/(2.pi..multidot..phi..sup.2)&lt;4.times.10.sup.5 (erg/emu.sup.2).

Magnetic recording media for longitudinal recording

Growing community of inventors

Odawara, Japan

Shyuichi Kojima