Copy cd's

Greetz all I have a problem. I need to make copy's of the full set of Suse cd's. The "other" sysadmin here is notorius for losing them and he is now using mine!!! For some reason I can't get the cd's from no4 onwards copied. Anybody know?? Come to think of it I want copies myself and lock up my originals;-) Ciao Mozzi