| 摘要 |
A recording disk holedr hold the inner radius face of a recording disk by pressing the face only in the radial direction so that the top surface of a cover of a casing of a recording disk holding apparatus and the disk holding shoes are at the same or lower level of the top surface of a recording disk mounted on a mounting part. Grooves are formed in a contact surface of a nail portion. The grooves engage with the bumps and dips of the inner radius face of the recording disk, so that the frictional coefficient is improved and the recording disk holding force is improved.
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