I have a 2TB Western Digital "My Book Essentials" external drive for Time Machine that has gone missing. Its icon sat on the desktop till sometime in the last day or two, and now Snow Leopard and Disk Utility can't find it anywhere. I have rebooted, unplugged/replugged, changed USB ports, changed outlets for its power adapter, etc. It is still running as usual, nice and quiet with its tiny light on. It still powers up when plugged in. No weird sounds. I plugged it into a Windows computer and it was recognized as an unreadable USB device (since it is formatted for Mac). So apparently it is still a functional something. My secondary TimeMachine drive, also a WD My Book, is still recognized and running as usual. Any help or ideas? Thanks!
What significant items have been irretrievably lost? [more inside]