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Re: Galaxy S3 microSD card died, not recognized
It depends on what died in the card. There's a whole computer in there - RAM, ROM and a controller (like a CPU). If the controller or RAM died, the manufacturer can take the storage chip out and recover what's stored on it (for about the price of a nice new car).
If the controller is just not seeing the directory of files, you can try using PhotoRec - CGSecurity Download it (it's free, but worth a fortune), burn it to a CD and boot your laptop with the CD. Plug the SD card into an adapter and plug it directly into one of the USB ports of the laptop (not into a USB hub). If the laptop can find the SD card, PhotoRec can recover any block of data that looks like a file format it recognizes (there's a list of them at the site, and it includes any picture format I've ever heard of).
If the card is completely unrecognizeable, you won't be able to format it - the computer has to see it to format it (and if the computer can see it, so can PhotoRec). If it's that bad, and it's a SanDisk card, try SanDisk device NOT detected by Windows PC first. If that still doesn't let you get into the card (if PhotoRec doesn't find it, it's not a Windows Registry problem, since PhotoRec doesn't use Windows), contact tech support at SanDisk Contact Information (They're pretty good about replacing cards that go bad.)
If it's not a SanDisk card ... well, that's why I only buy SanDisk cards.