FAT32’s 4GB file limit can block large SD card transfers

SD cards that refuse files larger than 4GB are usually formatted as FAT32, which has a built-in limit on the size of any one file. The card can still have plenty of free capacity; the restriction matters most for large files such as 4K video.

Reformatting the card as exFAT removes the 4GB limit, but erases its contents, so back up files first. Older cameras and other devices may not support exFAT: it was added in Windows Vista SP1 and OS X Snow Leopard. Windows and macOS can format cards using their built-in tools; Windows does not offer FAT32 formatting for cards larger than 32GB.