When I'm using TOUCHGFX and FATFS together, I can create/write/read a file in my SD only if I do it before "MX_TouchGFX_Init();"f_mount(&SDFatFS, (TCHAR const*)SDPath, 0);f_open(&SDFile, "DIO.TXT", FA_CREATE_ALWAYS | FA_WRITE); //with TGFX this one g...