Verify 3DS SD card filesystem
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This guide helps to verify the filesystem on an SD card.
To check if an SD card is fake or failing, follow the steps on 3DS Hacks Guide:
Windows
- Open File Explorer → This PC
- Right-click the SD card and click Properties
- Go to the Tools tab, then click Check under Error Checking
- A prompt titled "You don't need to scan this drive" might appear, click "Scan and repair drive" if it does
- If there are any errors, Windows will try to repair them. It will display if errors were fixed or were not.
- If it failed to repair errors, the SD card might need to be re-formatted, which can be done following this on 3DS Hacks Guide: Formatting SD (Windows)