Inside, you’ll find files like:
In AetherSX2 Settings → Memory Cards, you can assign two cards. Keep your main progression on Mcd001 and cheat/modded saves on Mcd002 . Swap them in-game via the PS2 Browser.
: To manage or format memory cards, open the AetherSX2 side menu and select "Load BIOS" Portability
Now, let's save your game data: