======Create .iso image from a CD======
<code>
su - root
mkdir /mnt/cdrom
mount /dev/cdrom /mnt/cdrom
cd <local directory for .iso>
dd if=/dev/cdrom of=filename.iso
</code>

now check that the creation is okay with:
<code>
sum -r /dev/cdrom
sum -r <filename.iso>
</code>

The 2 values should match.