whenever you are in test mode, if your USB is hooked up it appears under the "My Device" folder. You can open and copy files on there as you choose. Though you need a SD card to get the unit into testmode, if you are like me and have a billion USB sticks then it really helps, because you can put more things on a 4GB usb than on my 2GB SD. I just thought i would share that tid-bit. Sorry if it has already been noticed/posted.