I just had this card die in my Samsung Galaxy Note 2. Can't write to it anymore as any changes get removed as soon as i reboot or unmount the card. Videos copied to it do not play, some of my MP3's on it also don't play anymore. It worked great since February this year when I bought it, then about a month ago it wiped out all my data and I had to run a recovery app on it to get my photos back. Then did a low level format. Worked fine for another 3-4 weeks and now again, problems. I'm going to chuck this one and get a Samsung card now as the reviews for it are way better and it's going to be used in a Samsung phone, so it should be a better purchase for me. Plus the Samsung one has a 1 year warranty while this does not.