irritated post ^^ @yezeiyashein: Excuse-me but I MUST say, are you n00b ? Have you read a bit what is "optimization" of an ISO file ? This "optimization" present in many programs (like UltraISO, CDIMAGE ..) doesn't compress anything, it will put once a file which is present many times, so these programs can put 4800Mb on 480Mb if the 4800Mb contains 10 times the same 480mb data. (btw, sorry for my language ...)