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by userbinator 20 hours ago
After copying the files, macOS created several ._* AppleDouble metadata files on the FAT32 partition. These are normally harmless on a Mac, but console recovery environments may interpret them as additional files, so I removed them before returning the card to the Wii U.

There is a setting which can help with Macs leaving those files on everything they touch: https://varunbarad.com/blog/til-avoid-ds-store