You should change the CDROM lines in the fstab.
First, in /etc/fstab get rid of the word "kudzu" on the cdrom line.
Second, in /etc/fstab change the word owner to users on the cdrom line
save it and it should let you unmount and eject now.
/dev/cdrom /mnt/cdrom iso9660 noauto,users,ro 0 0
/dev/cdrom1 /mnt/cdrom1 iso9660 noauto,users,ro 0 0