Just a quick note on how to get USB 3.0 in Virtualbox for VMs that were
created with USB 1.1 support only. First, download VirtualBox Extension
Pack from here. Install
it. Then quit Virtualbox completely. Go to your directory that contains
your virtual machine and edit .vbox file. Replace the whole
<USBController> section with the following:
<USB>
<Controllers>
<Controller name="xHCI" type="XHCI"/>
</Controllers>
<DeviceFilters/>
</USB>
That’s it, let me know if it works for you !