I've noticed this behavior on both my upgrade installation of Leopard, as well as the clean install I performed subsequently. Sometimes when I put a CD into my 12" PB, the CD doesn't mount. That is, the CD's contents flash on iTunes (after the optical drive makes its noise) but then disappears. The CD doesn't appear on the desktop or finder, either. This doesn't happen on every CD. However, 100% of the time ejecting the CD and reinserting it works properly. So it's not a show-stopper now, but I'd like to know what's going on. Any ideas? Can I remount the CD, perhaps using disk utility or something, without ejecting and reinserting? Is this more likely a software bug or is my optical drive failing?