The Furukawa Electric Co., Ltd.

Uacj Corporation

Keita Yoshimura

Hideki Takahashi

Toshihiro Nakamura

Kotaro Kitawaki

Naoki Kitamura

Wataru Kumagai

Kimie Imakawa

An aluminum alloy substrate () for magnetic disk satisfies at least two of three inequalities of an inequality group [A] and satisfies all of four inequalities of an inequality group [B], or satisfies at least two of the three inequalities of the inequality group [A] and satisfies all of four inequalities of an inequality group [C], when a plate thickness of the disk at a position (b1) is defined as t, a plate thickness at a position (b2) is defined as t, a plate thickness at a position (b3) is defined as t, a plate thickness at a position (a1) is defined as t, a plate thickness at a position (a2) is defined as t, and a plate thickness at a position (a3) is defined as t.

Aluminum alloy substrate for magnetic disk, disk drive device, method for manufacturing aluminum alloy substrate for magnetic disk, and method for measuring aluminum alloy substrate for magnetic disk

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Tokyo, Japan

Keita Yoshimura