After the recent apple update my ipod now displays the folder with exclamation point icon. When plugged into my macintosh it says "You have inserted a disk with no volumes Mac OSX can read". My ipod will not show up on the desktop or in itunes, and I have tried resetting, restoring, disk utility, and nothing will make my ipod readable. In disk utility it says its unmounted, is there any one who can offer me help??? I need it badly!