| 摘要 |
A disk assembly includes a disk as a recording medium having a center hole whose center hole defines an inner cylindrical surface. The disk is provided with a first mating portion such as a chamfered end at the inner cylindrical surface, and a hub structure to be connected with the inner cylindrical surface of the recording medium. The hub structure has a plurality of divided hub members inside the center hole, the hub member being formed by dividing the hub structure fanwise by a predetermined angular pitch. The hub members are provided with a second mating portion, typically a groove, at a location opposed to the first mating portion, wherein the hub members support the disk by fitting the second mating portion into the first mating portion.
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