Greetingz!
By "copy to ram", you mean during boot-up, copy itself to a RAM disk so you can use your CD/DVD ROM drive?
Try
knoppix. It's had a boot-time option ("
toram") for the CD and DVD versions for a while now. A note of warning; the DVD used to want 4GB of
free RAM, so you would have to have more than that (6GB or so) for that to work.....and boy does it take it's time.