Extracting Switch Saves from an emuMMC Image: Non-Standard AES-XTS, FAT32 and DISF

Wed, 16 Sep 2026 10:00:00 +0000

For a while the only thing left of my hacked Switch was its 512GB SD card. The goal was narrow: rescue the game saves I had accumulated and move them into Eden, a yuzu fork on Android, so the games could continue.

I plugged the card into a USB adapter and opened Nintendo/save/ first. Two saves were there, 8000000000000000 and 8000000000000124, both NAX0-encrypted system saves with no relation to game progress. I walked every visible directory and found nothing resembling a game save. That was counterintuitive: the console had produced those saves, so why were they not on the card.

Reverse Engineering on Time Friend

Extracting Switch Saves from an emuMMC Image: Non-Standard AES-XTS, FAT32 and DISF