Extra wrinkle: the filesystem you have to use changes based on the capacity. SDHC and SDXC are basically the same protocol, but one mandates FAT32 and the other

Extra wrinkle: the filesystem you have to use changes based on the capacity. SDHC and SDXC are basically the same protocol, but one mandates FAT32 and the other wants exFAT. This is based on the same 32GB limit that Dave Plummer snuck into Windows NT on a whim[0], even though FAT32's structures can go up to 2TB and Windows can totally parse filesystems that large. Some devices actually will take reformatted cards that are "technically" "out-of-spec". You aren't supposed to be able to use SDXC cards with FAT32, but devices that never bothered with exFAT will still accept them. This is in fact the only way you even can use a large card on a Nintendo 3DS. [0] https://www.youtube.com/watch?v=bikbJPI-7Kg https://www.youtube.com/watch?v=bikbJPI-7Kg