To provide a substrate for a magnetic disk which is high in reliability by suppressing the occurrence of a crash failure even when a magnetic disk is quickly rotated, and which is suitable for a hard disk to be started and stopped in a load/unload system and a magnetic disk using the substrate of the magnetic disk.
A substrate for a magnetic disk is representatively constituted as a discoid glass substrate 10 including: an almost flat main surface 11; an end face 12; a chamfered surface 13 formed between the main surface 11 and the end face 12; and an alienating part formed in a circumference in the main surface so as to be raised with respect to a flat surface other than the circumference, in which the alienating part is formed across the whole periphery of the glass substrate 10, and a pole part raised maximum in the alienating part is disposed with an almost the same distance from the center of the glass substrate 10.
PHANDORN KRAISORN
NISHIMORI KENICHI
HOYA GLASS DISK THAILAND LTD
| JP2001344744A | 2001-12-14 | |||
| JP2003242627A | 2003-08-29 | |||
| JP2001344744A | 2001-12-14 |