Many things! First of all, our 625s have a USB host port, not a client port. So you cannot hook the 625 up to your computer directly. The external hard disk is not available for 625s, nor is the Archos gen 5 Dish plug-in. About the only thing you can use the USB port for is the discontinued PocketDish players. Some people have found they can display photos with a memory stick. Perhaps that's the menu item you found.