To mount an iso file
make a directory named /mnt/test
open terminal
login as super user using command su
#mkdir /mnt/test
change to the directory where the cd or dvd image or the iso file is residing and type the commands
#mount -o loop -t iso9660 file.iso /mnt/test
you will have the file mounted in directory /mnt/test
to unmount the iso file use command
#umount /mnt/test