I plug it in to my computer and the computer recognize the usb connection but not the hard drive. When double clicking on the "My Computer" icon to see the list of connected hard drives, the only two drives that shows up on the list are my two internal drives, Drive C and Drive E. Supposely, if the external hard drive would have shown up under the list, it would have shown up in the list area that says "Devises with Removable Storage" but even in this list area is still not showing up. Because of this, there's no way of formating the hard drive.