Copying Selfbootable games (Cd 2 Cd)??? Help!

I use Nero to copy non selfbootable Dreamcast games Cd 2 Cd. It works fine for those games, but when I do the same thing for selfbootable games (Cd 2 Cd) it does not work! It burns, but does not load on the Dreamcast!
Pls Help!!!! What program? what do I do? any other way!!!!! Thanks