| 摘要 |
A disk cartridge and drive assembly including a disk cartridge having a case assembly rotatively accommodating therein a disk including a metallic center hub having a center hole therethrough, the case assembly being formed by an upper case without a center opening and a lower case having a center opening therein, the disk cartridge comprising: a projection protruding from an inner surface of the upper case and capable of being freely inserted through the center hole of the center hub, and a disk drive capable of rotating at least a disk accommodated in the case assembly and having a metallic center hub, the disk drive comprising a rotatable portion including a magnet for attracting the center hub which appears in the center opening formed in the case assembly, a drive pin to be inserted into a drive hole formed in the center hub, and a flat portion on which the center hub is mounted, this flat portion having an annular groove formed therein creating an outer flat portion having a flat surface and an inner flat portion having a flat surface, and a clamp member disposed for engaging the marginal portion around the center hole of a disk mounted on and supported by the outer flat surface of the outer flat portion surrounding the annular groove when a disk, accommodated in a flexible jacket and having no center hub, is used, and is arranged to come into close contact with the outer flat portion and with the side outer surface of the annular groove and the marginal surface around the center hole in the disk.
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