I can copy Safedisc 2, but not Diablo 2??

[Paradokx]

I use a Teac 512EB Writer as my reader. I write using my Phillips cdrw 800. I have easily copied C&C Red alert 2, and Delta Force: Land warrior (Safe disc 2), Every time I try to back up my Diablo 2 Play disc, it is a coaster! I use Clone CD to copy with this setup. I know Diablo 2 is Securom, and not safedisc 2. I thought that since my setup can read the subcode, and such, and that I can copy Sd2, I could easily copy Diablo 2. If anyone can help me, or tell me if it is impossible, please let me know. Thanks alot.