Scenario: During the installation of Logic 9 (Logic Studio) and on Mac OS X 10.8, the installer can prompt for the next CD / DVD but not actually eject the current disc.
A force eject doesnt work, and no amount of prodding, poking or ejecting or draging to the trash, or using disk util works…
Solution: open terminal and run the following
besure not to click cancel installation otherwise the DVDROM will be locked until reboot
sudo drutil eject
enter your sudo password
continue install with next disc
make phat music!