I'm sorry is this is a bad question, but here goes... I copied a dell windows 7 x64 disk for testing purposes (Using Ultra ISO) from a friend that had an original DVD that he got with his new Inspiron laptop and noticed that the size was over 5 GB?!?! I burned using a dual layered DVD and it did burn fine, but, why is it this size? are both x86 and x64 on this disk? I have an original x64 oem that is 3GB, that is why I'm asking.