How Do I Put Games on My Gdemu SD Card?

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By Valerie Becker

Are you a fan of retro gaming? Do you own a Sega Dreamcast with a Gdemu installed and want to know how to put games on your SD card?

Look no further! In this tutorial, we will guide you through the process of adding games to your Gdemu SD card.

What is Gdemu?

Gdemu is a modchip for the Sega Dreamcast that allows you to play games off an SD card. This means that you can have multiple games on one SD card, rather than having to switch out individual discs. The installation process for Gdemu can be complicated, so it’s best to have it installed by a professional or someone who has experience with modding consoles.

Preparing Your SD Card

Before we begin, make sure your SD card is compatible with Gdemu. Gdemu supports SD and SDHC cards up to 32GB.

Next, format your SD card to FAT32. To do this on Windows, connect your SD card and open File Explorer.

Right-click on the drive assigned to your SD card and select “Format”. Under “File system”, select “FAT32” and click “Start”. Formatting may take a few minutes.

Downloading Game ROMs

Once your SD card is formatted, it’s time to download game ROMs. ROMs are digital copies of games that are played on emulators or modded consoles like the Sega Dreamcast with Gdemu installed.

There are many websites where you can download game ROMs, but be aware that downloading copyrighted material may be illegal in some countries. Make sure you only download ROMs of games that you own physically.

Organizing Your Games

After downloading game ROMs, create a folder for each game on your SD card. Name each folder after the corresponding game.

Inside each game folder, create another folder named “GDIS” and place the game’s GDI file inside it. The GDI file is the main file that tells the Dreamcast which files to load for the game.

If the game has multiple tracks, create a subfolder in the game folder named “track##” (replace ## with the track number) and place each track’s BIN and CUE files in it.

Transferring Games to Your SD Card

To transfer games to your SD card, connect it to your computer using an SD card reader. Open File Explorer and navigate to your SD card.

Drag and drop each game folder onto your SD card. This may take some time depending on the size of the game.

Once all games are transferred, eject your SD card from your computer and insert it into your Gdemu-equipped Dreamcast. Turn on your console and select “GDmenu” from the main menu screen.


Congratulations! You have successfully added games to your Gdemu SD card.

Now you can enjoy multiple games without having to switch out individual discs. Remember to only download ROMs of games you own physically, as downloading copyrighted material may be illegal in some countries. Happy gaming!