I really hope someone can help me here. . . I was adding some music to iTunes downloaded through acquisition x, and my external HD (Seagate 320 GB) all of a sudden has no music files anywhere on it. The available space is still the same as when i had 40 gigs of music on it, and iTunes says on opening: "The file "iTunes Library" does not appear to be a valid iTunes Library file. iTunes has created a new iTunes Library and renamed this file to "iTunes Library (Damaged)." I can't find any .xml or .itl or a (damaged) library file ANYWHERE. THEN the next dialog display says the iTunes application could not be opened, the required file is in use. So used an applescript to unhide invisible files and folders, and the .Trash is empty, Finder's trash is empty, searched all OVER for any trace of the .mp3 files in my library, but they have disappeared. I also can't unmount or eject, verify or repair my External because it is "in use." The only process running i can see is finder, though I'm not sure. Any ideas? Please help; 6 years of music means a lot. . .