There's a lot of counterfeits on these, and I apparently picked up a bum card from MemoryWhiz. My device shows me there's a 32gb of space there; it just is impossible to gain access to it. Rather, the /sdcard folder is found on my device's internal memory (the memory that came with the device). I even downloaded some apps that were supposed to read and write from my SDCard, but they work even when I unmount the card and remove it. So check out these cards thoroughly when you buy them and make sure they're what they say they are. Naturally, SanDisk isn't going to stand by a counterfeit.