Nice kvm/usb-test.

lsusb
...
Bus 002 Device 007: ID 0781:5406 SanDisk Corp. Cruzer Micro U3
Pass that to KVM, and ask for the boot menu:

sudo kvm -m 512 -smp 1 -drive file=/path/to/hardisk/file.img -usb \
-usbdevice host:0781:5406 -boot menu=on


*SPLOOSH*