If you look through the reviews you will see that this card seems to have both a failure rate and a incompatibility with some devices. I bought this card in November of 2012 and it worked great for a while. The card started failing in my Galaxy Note 2 in the beginning of January. After reformatting and trying the card in other devices it still does not work. Please understand that this is not a user error but appear to be something wrong with the card itself. I have tried the card in 3 different phones. 1 with stock Jelly Bean, 1 with Ice Cream Sandwich, and 1 with a Cyanogenmod custom firmware. All 3 devices have problems and say "blank sd card" or "unsupported filesystem". Even formatting the card in both Windows and using Android do not seem to fix the issue. I was happy to find such a good price on a large microsd card but sadly it looks like you get what you pay for. It does appear that some people are having luck so it might be worth a gamble of $20 if you are feeling lucky. If you do buy this card it would be wise to double check your backup process to make sure you do not lose pictures or videos if you have this problem. I am glad I used dropbox for my phone so I did not lose any pictures or videos.