As a comparison to my last post, all that work of installing applications is moot in Linux.
To create an image (link to a more verbose explanation) use dd on an unmounted CD/DVD drive:
dd if=/dev/cd of=cd.iso
To mount an image, if your kernel is compiled with the loopback block device and ISO 9660 built in (link to a more verbose explanation):
mount -o loop -t iso9660 cd.iso /mnt/isoimage/
Wikipedia on ISO
Keywords: ISO, mounting, ISO mounting, CD emulator, DVD emulator, Daemon Tools, Mount ISO, Linux, Linux CD emulator, Linux DVD emulator, Gentoo Linux.