I need help copying DC games

[New guy]

I hope someone here can help me. I have a 56k modem so I can't download the .CDI files, I have a friend that has a cable modem and he has downloaded the files and burnt them onto cd's. Now I am trying to copy his cd's, but every time I copy one and put it in the DC all that will appear is the DC logo and then the sega logo. I have tried using Disc-Juggler, CD Clone and Blind Write. Has anyone else had this problem, or is my cd burner not compatable? By the way, I have successfully burnt one game, but every attempt after that has failed. Please help.