n900 say corrupted memory card
 

hi all
i think you are all fine
i am in a lil trouble after successfully installation of android N12 UMay my phon say corrupted memory card in android and i cant be able to download or recive any thing or capture photos,but in setting i can see 859mb free memory.
in notification area i see a corrupted memory card blinking but if my card is corrupted so why android's other options are smoothly runnig?
and now what i do? format my card or use it without joy

for suggations thanks in advance :)