- The 3DS can only read SD cards formatted as FAT/FAT32 (not exFAT or NTFS). SD cards 64GB and larger ship as exFAT, so if your card is of that size then you will need to reformat your SD card.
- Formatting your SD card will delete all data on it, so if there is any important data on it, make a backup of it first.
- Due to cluster issues, the 3DS runs into weird issues on SD cards 200GB and larger (in particular, custom themes no longer stay applied and GBA VC has screen wraparound issues). Loading time also gets exponentially longer the larger the card is.
- SD cards do not currently exist in a 2TB capacity. If you bought a card of such a size, you've been scammed. You should not use the card to save any important data (including 3DS data) due to data integrity concerns.
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