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Relation: subclass

DigitalDataStorageDevice25An instance of DigitalDataStorageDevice is an ElectronicDataStorageDevice intended to be used...^
    ComputerDisk5A type of DigitalDataStorageDevice that is disk-shaped and is read while being spun in a DiskDr...^
        HardDisk2A type of ComputerDisk that is hard, rather than floppy. The 3 1/2'' floppy disk is considered a ...^
        RemovableDisk2A type of ComputerDisk that can be temporarily installed in a computer (in a DiskDrive) and is ...^

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