I bought the Ultra microSDXC 64GB memory card for my new Galaxy S3. But when you copy the existing data on Win7 PC came only error messages to 13GB. No Bite free more. Card full! I have the card then formatted the PC with FAT32. (A free add-on program from the network, because Windows can only format up to 32GB). After that I could copy my data easily on the map. In my Samsung S3 it was immediately recognized and has been working for the fast and without problems.