I purchased an external USB2 hard drive case (that has a power cable and USB output cable) and installed a 120GB Seagate drive. It seems like my laptop (running XP, USB1) will recognize the drive when I plug it in (as an USB Mass Storage device) but it does not give it a drive letter (like E) for me to access it. I have tried changing the Master, Slave, Cable Select jumper on the drive with no success. When I plug in a USB thumb drive, my laptop assigns a drive letter and I can access it via Windows Explorer with no problems, but with the 120 GB external drive, I have no luck? The drive shows up under the Control Panel.....Device Manager as a hard drive just under my laptop drive, but there is no way to store files on this external drive. Any suggestions?