I have a 500GB external drive partitioned in two 250GB partitions. Connected via firewire to my mac mini. Its been working great for almost 2 years, until now. It will not mount and will not show in disk utility. Ever now and then after a restart of the mini it will show, but, only one portion will mount. The other half refuses. The one that shows says "Format: unsupported" in disk utility on the rare occasion it mounts. So its useless. Disk utility will not let me do anything to the drive. I have tried it on the mini with FW, Macbook with USB and Ubuntu. It only shows one partition (unsupported) after a lot of fuss, restarting the mini a few times. Any ideas how to fix this, before I call it quits and buy a new drive?