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When configuring USB device settings for a virtual machine, you can enforce what types of USB devices are allowed to be connected. For example, if storage devices (in general) are not allowed, the Mac user will not be able to connect an external hard disk or thumb drive to the virtual machine. This functionality is available in Parallels Desktop Business edition only and is absent in other editions.
To enforce USB device policies, open the virtual machine configuration window and select Hardware > USB & Bluetooth.
In the Allow external devices list:
Clear the types of devices that you don't want Mac users to connect to the virtual machine.
Select the types of devices that should be allowed.
