How to copy a copied game with a dummy filles (i think it is it !)

I looked in the forum the way to be able to copy a copied game with a dummy file bu I DIDN'T find it, please help me, I'm not a newbie, I have few knowledge in the dreamcast world but not for that problem !!!
Is it possible for me to copy a copied game with a dummy fille (I think that is how you call those protection which is a file bigger than the size of a cd !)
I tried with many software as DJ, nero, psx copy but every time it says that the size of my blank cd is too short !!!!!

Thanks in advance !
Toto 007 !
HELP.....help...
Toto007 !!!