| 摘要 |
A device for a flexible magnetid disk comprises a motor, a spindle directly connected to the motor, and a cup member to be mounted on the spindle to support under a pressure a flexible disk, wherein an annular rib is formed in either one of the spindle and the cup member at a position corresponding to the fitting part of the center hole of the flexible disk and an undercut portion formed in the other at a position opposing the annular rib.
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