Some time ago, I was asked to share notes and details of how I archived my old CDROM media and I did reply in the thread, but never really posted the guide I wrote otherwise.
So here is the crappiest guide to dumping CD/DVD images on Linux/Unix-likes, in case it happens to be of use to anyone.
https://gist.github.com/mrdaemon/925f149da05b92cf3aea3f3a38f9db3e