Wii - where is the sdcard

Some (homebrew) games need to be located on the sdcard for working correctly, for example

On dolphin, it is possible to set where the sdcard is located and change other settings, I currently do not seem to be able to find similar option in the retroarch core.

Does such option exist? Either in the gui, or by modifying the configuration file directly? If not, does retroarch use a predefined location as sdcard for the wii core? If not, is there any way to play such games with retroarch?

I don’t have SD exclusive games to try, but I do have Excite Truck, which uses an SD card to store custom .mp3 files to play during races (this option exists in the base game) - it works and my tracks plays using the Retroarch core.

I modified my Dolphin standalone setup to share the same folders used by Retroarch’s core (I don’t think you can change these ones), and I can switch between both without problems - Wii save files works on both core and standalone, GC files too, and SD seems to be recognized by both too.

I believe you should be able to reach the same result following my setup - just do all the work using the standalone version, and see if it works using the core :

https://i.imgur.com/LseTuiR.png

https://i.imgur.com/kJea9TA.png