Have you tried a reboot.
Put the card in shutdown, then swich on and I bet it will be there - it seems that the S7 does not hot mount SD cards
Pete
Sent from my s7 using Android Tablet Forum App
Bought this for my table as i saw that 16gb was the maximum supported, however its not working i have not got an adapter or a memory card reader to test whether or not its the memory card thats not working, which would be insane seeing as its brand new any help?