VirtualBox supports USB 3. Windows 7 supports USB 3 but doesn't come with a USB 3 driver -- that's a Gotcha BTW preventing win7 from installing on PCs & devices that use main or motherboards with newer chipsets. A driver that works in win7 VMs, once USB 3 is turned on in the VirtualBox Mgr., is going to be pulled from Intel's site next month. There *may* be other drivers that work fine, but if you want/need a copy of this one, if only to hold onto in case, get it now.
downloadcenter.intel[.]com/download/21129/USB-3-0-Driver-Intel-USB-3-0-eXtensible-Host-Controller-Driver-for-Intel-7-Series-C216-Chipset-Family