In the USB pane of Parallels Desktop Preferences, you can specify how to handle USB devices that are plugged into your Mac.
You can choose a general action to perform when a new USB device is plugged into your Mac by choosing one of these options:
You can also set permanent assignments for certain USB devices. These assignments are displayed in the Permanent assignments list.
To add a new assignment:
Note: You can connect up to eight USB 2.0 devices and up to eight USB 1.1 devices to each virtual machine.
You can change an assignment by editing the device and destination in the USB Device and Connect To fields.
To remove an existing assignment, select it in the Permanent assignments list and click the Remove button .
For more information about using USB devices in a virtual machine, refer to Connecting USB Devices to a Virtual Machine.
Locking Parallels Desktop Preferences
If you want to prevent Parallels Desktop Preferences from further unauthorized changes, click the Lock icon at the bottom of the window. The next time anybody wants to change the settings in any pane of Parallels Desktop Preferences, an administrator's password will be required.