It is used in USB closure. When I plug in computer it says "Found new hardware" but there is no hard drive display in My Computer. I also tried to open the USB closure and then plugged the drive to the computer by IDE cable. In the System Setup Mobo, it realizes the Maxtor 250GB but the drive is still gone in Window.
you may also have drive-letter conflict, which can also be resolved in storage management. If drive is connected via a USB hub, there could also be problem with not being correctly recognized, particularly if you have windows XP, SP2. Look at microsoft knowledge base for articles relating to usb 2 connectivity problems.
Another try is to delete usb root hubs in device manager and let them re-install. that sometimes clears up usb connectivity/device identification issues.