Making an ISO image of a CD is one of the easiest things in linux. The only thing that might confuse you is the device file to use so here's an explanation:
Your IDE CD drive, burner or DVD is one of the following:
- primary master = /dev/hda
- primary slave = /dev/hdb
- secondary master = /dev/hdc
- secondary slave = /dev/hdd
If you don't know what I'm talking about you can guess. /dev/hda is most certainly your harddrive. Your best bet for the CD drive is /dev/hdc, but could be any of the other two.
Here's the command to create your image:
dd if=/dev/hdc of='mycd.iso'