SD Card WTF

i've tried it on the computer it wont work. and now all of my rock band 2 DLC is off my SD card and it wont allow me to save anyhting to it.
 
It wont allow me to format, when i put the SD card into my computer it wont pop up. but when i click on it in My Computer. it says it hasnt been formatted. would you like to format it? i click yes but then it says that it wont allow it. and after that i cant do anything else to the card
 
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