Originally Posted by THE W
For those who have lost sd cards have you done any of the following:
Formatted the card to a different file format than it originally came.
Updated to jellybean.
Powered down your device.
Disconnected your phone during a transfer process.
One card that S3 said was bad I was able to reformat in my camera. It's still there and working fine.
The next card that the S3 complained about was successfully reformatted in the S3, but a day later was bad again and couldn't be read or formatted by my camera.
Both were 32GB Lexar class 10 cards. (microSDHC).
Both of these failures were on ICS.