Big Papa, Got a challenging burning question for ya! (others feel free to try!)

Ok, here' sthe deal: I was copying dc games with DJ, which all work great. However, I ran out of empty discs when I wanted to copy Tokyo Highway battle 2. So I copied the contents of the entire cd to my HD, thinking I would just be able to copy those files to a cd later...

Now my question is: is it possible to make a working copy of these files from my HD? The game is a self-boot. I tried the burn it with DJ2 and DJ3, but those copies didn't work. If it's possible: which program/settings do I have to use? Do I have to convert all files to a *.bin/*.cdi format first? Ie: how do I make a working backup from these files on my HD?

Thanks!!