cyclo ds-sd card error

I got cyclo ds for 30 bucks used at a local game store today and up until now it worked fine. When I got home I downloaded some games,got moonshell to work,and put all of streetlights music on it. But about half an hour ago i went to copy some more roms onto it and it said please insert disk or no disk in removable disk g or something like that.i then decided to restart and now when i put it in when the removable after like 5 minutes it asks if i want to format it and i say yes then it says it couldnt and when i try to open it it says g is not accessible incorrect function. And when i put it in my ds it says "micro sd card is not formatted with fat 16 or fat 32. please format the micro sd card before using cyclods evolution." Can someone tell me how to fix this i wont even mind if i have to copy the files all over again i just want it to work again.

Try running chkdsk.

"this disk check could not be preformed because windows cannot access the disk."

your microsd card or reader is bad then.

is there any way to fix it or do i just have to exchange it?

Replace it yup.

There's probably nothing wrong with your card. I has some card issues too, but you need to format your memory card properly. You need to download this software. You should never format your cards with Windows XP. Hard-drive formatting is different.http://www.sdcard.org/consumers/formatter/

have you tried updating your software??