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I have run into this - sometimes it seems to be solved if I wait about a minute and then try again to unmount. Also, make sure that nothing "else" in you system is using the CD-ROM. On my Rh9 system for example, if I insert a CD into the drive under KDE, the CD gets mounted automatically and Konqueror starts up to show me the contents. It is easy to forget that the Konqueror windows is still open and then to try and unmount the drive - which fails of course because umount detects that a process is using the CD (Konqueror) and thus refuses to allow me to unmount. The solution usually is to close the Konqueror session, wait about 30 seconds, and then try to unmount, which usually works.
Maybe you have some process other than the Diablo install accessing the CD and that is why your system refuses to unmount?