Most of these replies assume you are connecting via a USB port and the operating system should find it there. My external enclosure is connected to my mobo's eSATA port, so I had to enable that port in the BIOS setup. The operating system just sees it as another SATA drive. The fun part is: it is there or not there, depending on whether I turn it on or off, because eSATA supports hot swapping. Win XP Pro is completely happy with that deal.