I am backing up some games to my hard drive that are currently on CD or DVD. I am using Alcohol's suite to do this. I have ripped all discs to ISO that will allow it, as ISO is a universally open image format that I can count on to be supported forever. HOWEVER, some discs contain multiple tracks, and discs that contain multiple tracks cannot be converted to ISO images (I don't know why this is, but, that's the way it is).
My question: What is the most trusted alternative to ISO that I can use for these special cases? I would like to use MDS, but that seems to be specific to Alcohol and I am hoping to avoid proprietary formats. I read that UDF is another open standard - can that handle multiple tracks? And if so, what is the best suite to use to convert these discs to images?
Any advice on this will be greatly appreciated. Thanks in advance!