I actually have a zero byte folder resulting from a jksm crash while backing up saves. No other further problems resulted nor does Windows have any issue with it.happened to me, i just winged it and didnt format it. it worked fine. but to be on the safe side i recommend backing it up to an img file or something then formatting it
i have 28 gb worth of games on it but the sd card works fine in my 3dsYou may have corruption.
Backup saves and what you can off of it, then reformat it.
i have 28 gb worth of games on it but the sd card works fine in my 3ds
i have 28 gb worth of games on it but the sd card works fine in my 3ds
i would suggest ripping the sd card to a .img using win32diskimagerCopy everything off to a computer , then format the card if it consistent with asking you to format, card might be dying.