| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a glass substrate for a magnetic recording medium, which suppresses fluttering displacement of the magnetic recording medium in a magnetic disk device, and is improved in impact resistance. <P>SOLUTION: The glass substrate for the magnetic recording medium is a disk-shaped glass substrate for a magnetic recording medium, which has a circular hole passing through the center and a pair of main planes facing each other. In the main planes, a clamp area including a point fastened by a fastening member when the magnetic recording medium is fixed to a hard disk drive has a flatness of 1 μm or less, and the clamp area has a plate thickness deviation of 0.3 μm or less. <P>COPYRIGHT: (C)2013,JPO&INPIT |
