My girlfriend had a similar problem with a UDF 2 formatted CD-RW when she tried moving files between her Ti and M$ boxes. The UDF 2 is similar enough to the UDF 1 which OS X supports that it seems to stuck midway through the mount process. We tried the Knowledge Base suggestion to reboot while holding the trackpad button down, but it didn't work. We took the Ti to the local Genius Bar, and without batting an eyelash, the tech plugged in a USB mouse, rebooted with that mouse button depressed, and the CD-RW was promptly disgorged. Apparently, holding the trackpad button often doesn't work for this purpose. Romain Kang Disclaimer: I speak for myself alone, romain at kzsu.stanford.edu except when indicated otherwise.