Micro SD card malfunction for R4

Ok, so I was playing a game, (Zelda: Spirit Tracks) and it froze. Nothing to worry about, I thought, it happens all the time. Well, when I turned it on again it did the "Loading..." screen as usual, but THEN it said "Micro SD card error" and... well, that was it. And now my computer isn't picking it up... well, it is, but is says "disk in drive G (variys per computer) is not formated, do you wish to format it?" But if I say yes, it says it has to wipe my card! And I have HEAPS of stuff on it! Last time I backed it up was WEEKS ago... Please help! :'(

Your MicroSD has been corrupted.
Tough luck.
Only thing you can do now is reformat it and put your stuff back.

Sorry,you WILL need to reformat it.that happened with me too.But mine was wy worse,cause that at time I've NEVER backed it up.I had over 40 saves of games.Sorry,but that's the life.Now I make a complete back up everytime anything might go wrong :D