I have many SD cards for my mp3 players as well, so I take a bottle of White Out , and use just a tiny drop or two to identify which is which. Example-two 32 G cards One card has one dot, the other has two dots, so I know what is on them ( made up a word doc with the info), The point is that with the drop or two of Whiteout on them, they are a bit easier to see.
