I used it for something like 10 months in my Galaxy S III (GT-I9305) with original firmware, mainly for pictures and flac files.Suddenly I perceived that the last pictures I took disappeared; I took some more pictures as I thought that were software problems but same problem until I realized that the card was not working. Now I can't write it anymore or delete information, format it, delete partition, etc. Now is a ROM. The bright side is that I did not lose valuable information like pictures that now are permanently stored in the card.