Let's say I have a DVD and AnyDVD-HD creates an image (ISO) with 7.2 GB. Browsing inside the ISO mounted I can only see the VIDEO_TS folder. If I ask Windows 10 the total size from said folder, it's 6.4 GB: ] Total size of the ISO, however, it's 7.2 GB like I said. Why is that the case? Also, I used a program that can create ISOs. Then I created myself two new folders: AUDIO_TS VIDEO_TS And just copied the files from AnyDVD's ISO (6.4 GB total) to it. The new ISO has 6.4 GB. You can see where I am going. Not only I ask WHY is that the case (800 MB?), I need to know if this new ISO can work 100% the same as the AnyDVD one. I use PowerDVD. And no, in this case I am not seeing anything in the ISO's root, like DVD-ROM material. Unless of course 800 MB are hidden. Another predictable difference between the two is that ISO #1 has the original date from my DISC (November 2, 2000) while #2 of course is from today, even though it's a copy. NOTE: the ISO AnyDVD created was decrypted, of course.