My external hard drive is the source for my itunes library--One file holds all of the songs I use for my itunes. I have 4-5 music files of other friends collections. I went in to my file, but the external locked up for 10 seconds or so, then opened up--and there were no files. Itunes still works though. I tried to delete a file--no go. Another of my friends files is doing the same thing, but the other three friends files open just fine. Any thoughts?