Make sure to format to FAT32 to be compatible with both AOSP and Touchwiz roms. If you're not running any AOSP roms, just pop the card in. It will be formatted to exFAT automatically. I formatted to FAT32 with guiformat in PC and haven't had any issues. *Optional* Search the xda-developer forum for instructions on swapping internal SD card with external SD card and give your phone 64GB of "internal" space for those apps that won't move to SD.