03-31-2007, 04:16 PM
I have heard of some enclosures being finicky about the jumper position, working better with the jumper set in the Master position. But usually that is consistent, not sometimes works and other times not. If the drive itself has not failed, check by hooking up directly to an IDE bus, or in another FW case, could be the power supply on your external case is gone bad. Symptoms of it starting to spin up, but never mounting sound like what happens when a drive does not get enough voltage on the 12 V side to spin up to full speed.