Hey there. To be truthful, the only flash card I own is the DS-X, and I don't know too much about trimming, but I do know that trimming is a way of getting rid of unnecessary space that is not being occupied by any files. This makes sense because there are no roms that are in between 64 MB and 128 MB and therefore a game that is actually 72 MB would have 56 MB of unoccupied space. I'm pretty sure that trimming takes away those 56 MB, significantly decreasing the size of the game. Please correct me if I'm wrong, but this is what I inferred from being told that trimming gets rid of unnecessary space. So anyways, because the DS-X is only 512 MB, it would be awesome if you could trim the roms. Is this possible? Am I right about what trimming is?