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I prefer the 5.1 audio tracks which i am assuming to be the DD 3/2+1. If I keep these and discard the DD 2/0, does the 3/2+1 play fine over stero or is it better to just keep both like mentioned before

Sorry for the question but I am new to this whole mkv thing. I have over 200 ISO's and was looking to convert them all into mkv's because from my research it seems that I am not losing any quality by doing so. I would rather better quality that takes up more space than wasting a smaller amount of sp...