ok, just to update you guys, I almost entirely recovered one of the 5 CDs. I had to restart the process because I needed to shut down my PC for other reasons, and now it is recovering it again.

The other four, no luck. They can't seem to be read at all. I can tell CDRoller to try to recover regardless by providing some info (joliet, single/multi session, etc.) which I do have, but I have not had time to give it a try.