[ubuntu] Recover or reformat dead SD card

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http://ubuntuforums.org – Hi, I have a SD card that suddenly stopped working. It's not mounted and isn't even seen on a few computers I've tried. In Ubuntu there's no change in the devices in /dev. Any one have any ideas about how to recover my data from the SD card or even how to wipe it and reformat it? I've found a bunch of guide on how to recover files from an SD card and how to reformat external drives but nothing that deals with a external drive that can't been seen or mounted. Thanks! (Hardware)