Disk Juggler problems

I am trying to copy a self boot copy. I am using disk juggler and I'm using the copy from same cdrom, and when I put the original selfboot in it reads it fine, but when it says to put in a blank cd I do and I hit start and it gives me an error. I tried this about 8 times. Is there anything I could do? Also what other programs are good to copy selfboot cds? thanks guys