Wirelessly posted (Htc Arrive: Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Nexus S 4G Build/GRJ22) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1)
Did you try to format on the PC and then format on the android. I had an issue once and I used a blackberry I had laying around fix it. Pop the SD card in the blackberry and it saw the error and request to fix it. And it did.
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PPC: T-Mobile's G2x // LG-P999 [unlocked & rooted] + CyanogenMod 7.2
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