I have been trying to clone various systems from sata internal hdd's to an external usb hdd. It clone is created successfully, but it will not boot from the USB hdd. I have definitely set my bios boot options right, removed all other hard disks etc.. and it will not boot. If I take the disk out of the usb case, and install it internally, the system boots fine. IS it possible to boot from USB with this product? What step am I missing.