>>11939049There are three SD standards:
SD - Uses the FAT16 file system. The cards can go up to 2GB (This is also the max partition size of a FAT16 partition but that's coincindental)
SDHC - Starts out at 4GB. Uses the FAT32 file system. The cards can go up to 32GB (This is NOT the max partition size of FAT32, it's 2TB, though modern versions of Windows have prevented you from formatting any partition over 32GB in FAT32, though third party software can do it)
SDHX - Starts out at 64GB. Uses the exFat file system. The cards can go up to 2TB
The Wii originally only supported SD, an update eventually added SDHC, though due to the way the Wii works games released before this update will only support SD.... for the very very few that had SD card support (like Excitetruck)
You could try using a third party program to force-format your 64GB card to FAT32 and see if that works. Otherwise, yeah, would want to get a 32GB card (Ideally 2GB, but good luck finding those). Actually, in many places it will even be hard to find a 32GB card that's not some cheap possibly bootleg. Make sure to test any card you end up getting with something like H2testw to make sure it's not a fake. Last thing you need is a card that claims 32GB but only stores like 1GB and corrupts anything past that mark.