Formatting an SD card/Windows

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This is an add-on section for formatting an SD card to work with the 3DS.

If the 3DS already recognizes the SD card, this guide is not required.

This page is for Windows users only. If you are not on Windows, check out the Linux or Mac pages.

What You Need

  • For SD cards 32GB or smaller: the latest version of SD Formatter
  • For SD cards 64GB or larger: The latest version of guiformat

Instructions (32GB or smaller)

  1. Insert your SD card into your computer
  2. If the SD card has any files and folders on it, copy everything to a folder on your computer
  3. Run SD Card Formatter Setup (the .exe file) in the downloaded .zip file with Administrator privileges, then install the program
  4. Run SD Card Formatter from the Start Menu
  5. Select your SD card’s drive letter for "Select card"

Make sure you choose the correct drive letter, otherwise you might accidentally erase the wrong drive!

  1. Enter anything for "Volume label"
  2. Ensure that "Quick Format" is selected
  3. Click "Format"
  4. Click "OK"
  5. Wait for the format to finish
  6. Click "OK"
  7. Close SD Card Formatter
  8. If the SD card had any files and folders on it before the format, copy everything back from your computer

Instructions (64GB or larger)

  1. Insert your SD card into your computer
  2. If the SD card has any files and folders on it, copy everything to a folder on your computer
  3. Run guiformat.exe
  4. Select your SD card’s drive letter for "Drive"
OOjs UI icon information-warning.svg Make sure you choose the correct drive letter, otherwise you might accidentally erase the wrong drive!
  1. Select a size for "Allocation unit size"
    • If the SD card is 64GB, choose 32768
    • If the SD card is larger than 64GB, choose 65536
  2. Enter anything for "Volume label"
  3. Ensure that "Quick Format" is selected
  4. Click "Start"
  5. Click "OK"
  6. Wait for the format to finish
  7. Click "Close"
  8. If the SD card had any files and folders on it before the format, copy everything back from your computer

Common errors with guiformat

Failed to open device: GetLastError()=32

Close everything that may be using the SD card, such as any File Explorer windows.

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