32, 64 GB USB 9 September 2009 Mac:  10.4 Win:  XP audio : 30 video : 6 Updated to include the upgraded internals from the iPhone 3GS; includes Voice Control support and bundled remote earphones. fourth 8, 32, 64 GB USB 9 September 2010 Mac:  10.5 Win:  XP audio : 40 video : 7 New thinner design including