NCosmany
I purhcased this card for my Hero 3 cam.  It worked all of last year, or the 3-4 times i used it.  I used it again this year and had some great once in a  life time ski videos and the card failed.  It could not be read or reformatted.  I lost all my vids.  It was strictly used in my hero 3 cam.  I pulled it out to try to retreive the vids using several PC's, multiple card readers, and recovery software but no good. I have never known a card to fail and I am extremely disappointed.Try another brand.  Next time I will use multiple cards with smaller storage and a different brand.