There is no Usb in the BIOS of virtual machine. I never found it. However, you can try to insert the U disk into the computer, open winimage software to make the U disk into a virtual hard disk, and then add it to the bios in the virtual machine. It's just that he will prompt that there is something wrong with the partition table of this hard disk. It can be used without repair. This is my usbDOS system. But winpe can't. I only tried two. You can try. .