thanks for the fast reply. i will use the mds, now that i know it does it for a reason there is no need for me to second guess it (and burning the iso=coaster). i uninstalled and reinstalled the program since the rip so i think the log would be gone, it was just the lego universe disk.
i made an image of a disk the other day and for some reason it gave me a .iso and a .mds ( i was just expecting the .iso). now when i go to burn this i choose the .iso right? which is to assume it gave me the .mds for no reason. just want to make sure im not messing it up.