What you are using (Windows 10, Windows 11, or Android)?
Over time, save files or virtual Wii system files can become corrupted. If the FST already exists but is corrupt, Dolphin will fail to write a new one.
The folder where Dolphin saves its configuration and emulated data might accidentally be marked as "Read-Only." Step-by-Step Solutions to Fix the Error
Add both your (where the Dolphin.exe is kept) and your Dolphin Emulator user folder (found in either C:\Users\[Username]\Documents\Dolphin Emulator or %appdata%\Dolphin Emulator ). 2. Run Dolphin as an Administrator
If you are using Dolphin in Portable Mode, switching to the standard, non-portable configuration is the single most effective fix. The development team has noted that this configuration can cause unforeseen issues with file handling.
This will not delete your save games. Save files are stored separately in /Wii/title/ .
If your "Documents" folder is restricted or synced with OneDrive, moving the data can stop the error.
menu, try moving the Wii NAND root to a different, non-synced folder on your drive. or finding the specific
While less common, it's possible that running more than one instance of Dolphin simultaneously can cause conflicts, as both processes might attempt to access the same FST file at the same time. Some users have speculated that ensuring only one instance of the emulator is running can mitigate the problem.
Ensure at least double the ISO size is free (e.g., for a 4.7GB ISO, have 10GB free). Dolphin may create a temporary copy.
This file keeps track of where data fragments live within the emulated console's storage.