Hello, I have a 256gb samsung evo SDXC card. My previous card was a cheapo 32gb card and I copied all of my files over from it. That first card worked fine the new card came formatted to exfat
you must format the SD Card to FAT32m you MUST!!!, Find a program that can format the sd card to FAT32 or if you have an xbox 360, format the SD Card with a SD CARD to USB adapter on xbox 360, so it will be FAT32, after that, delete ALL the files and folders that the Xbox 360 created, and you're ready to put all the Wii U games and homebrew, any questions, just reply me