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Help [Metropcs] 64gb Sandisk microSDXC Class 10 not mounting

In my case, I was having issues with exFAT. Ever since I formatted to FAT32, no problems.

Not sure if GSIII for Sprint is that much different from mine, but I was able to use exFAT once I reformatted with default allocation size using Win 7. Before reformatting the card was not recognized by my device. I like the ability to store >4 GB files.
 
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