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"External SD card now says "SD card blank or has unsupported file system"

after I attempted to backup on my computer. It is a Samsung Galaxy "Vibrant" running Froyo (2.2) I mounted the card upon plugging into my computer, opened explorer and attempted to copy files for backup. Now I don't see data on my computer, mostly photos and videos I'm concerned with. Can the data on the external SD card be retrieved? If so, how. Thanks!

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Steps for data recovery are described here: Corrupted 16GB Samsung micro SD card – Izzy Aug 26 '12 at 23:07

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