Just recently when attempting to copy files from a Dell XPS 630I SP3 computer to a Western Digitial external hard drive (My Passport Ultra & Elements Desktop) the transfer stalls at 5 to 10 seconds left and does not complete. I tried different USB ports, the monitor and front/back ports on the computer with the same result. The drives are recognized by the computer and I can access and play files from the external drives fine. I have used the external hard drives strictly as a drag/drop storage device without the installation of any of the WD software included with the drives. Rebooting did not help.
Other USB devices work fine in the same USB ports; camera, printer and thumb drives, both Sansdisk and HP. In fact, I can copy files from the computer directly to the Sansdisk thumb drive with no issues and I can also copy files from the Sansdisk thumb drive to the Western Digitial hard drives when both are plugged into the XP computer's USB ports without issue.
Thank you for the help.