Help micro SD card corrupted

I have an R4 and everything was working fine but when I had about 228 MB left on my micro SD card I put the R4 in my DS but it never loaded. When I checked the SD card there were all sorts of weird files I never saw before and some of my games bytes were modified. Any ways on how to remedy the situation?

I've seen a few people have the same problem as youself on these forums. Sadly I think they all got the same answer, format and move on.I hope I'm wrong, but it doesn't look good.

I had the same problem there is only one solution and that is formatting.

I see well It's a good thing I backed up all my files. Thanks for the help!