Have an external WD USB/Fire Wire Combo drive. The 120GB IDE drive failed with constant clicking sounds when powered and a failure to load the USB driver. I opened the case and replaced the WD1200 with a new WD200JB IDE drive. The drive now loads USB correctly and appears in disk management as unformatted. When I proceed with formatting it either fails as incomplete or forever reports formatting but no hard drive activity is taking place. I have tried connecting it directly to the IDE connector on the motherboard and have the same result.