Have this really annoying problem with a USB drive not popping up in the tree upon plugin. Dell Precision workstation 360 with Windows XP pro, with a NexStar SCSI hard drive dock. I plug the drive in and all will be fine - it is rocognized and accessible by OS. After awhile, it will drop, as in disappear - cant be seen and won't show up again after unplug/replug until the machine is rebooted. I have mapped the drive to a specific drive letter hoping that would help and no. The interesting thing is that i can go into manage-->disk management and see the attached drive, even change the drive letter, and even click on explore and open and the drive will be accessible, but once click on "folder" to bring up the tree on the left, the contents will disappear and the right window will go back to my computer, with no USB drive/drive letter present. This has been plaguing me for awhile. Any ideas?