I had a similar issue with an XD card in my Fuji FinePix S3000.
I had used the several times for a couple of years without problem.
The issue appeared right after dowloading pictures from the card inserted in my notebooks' card reader - an operation I have done several times in the same notebook without any problem.
I have fixed the issue going to Menu, Option, SetUp, Format and choosed OK.
Deleted all the pictures (make a copy before if the card is readable in the pc as it was my case) but made the card readable again.
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