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The advantage is that you can use a webcam which is not supported by the guest operating system of your VM. With this feature you can connect your host webcam to a guest machine. If you open VM settings ( Machine > Settings > USB) and try to enable USB 3.0 support without having VirtualBox Extension Pack installed, you will get the error message – Invalid settings detected. As a result, you can use a physical USB device in a guest operating system (OS). USB devices such as network adapters, flash drives, hard disks, web cams etc., that are inserted into physical USB ports of a host machine can be attached to a virtual machine running on VirtualBox. The Extension pack adds the following functionality:
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VirtualBox Extension Pack is a binary package intended to extend the functionality of VirtualBox.
INSTALL VIRTUALBOX GUEST ADDITIONS FOR MAC HOST WINDOWS 7 HOW TO
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