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How to set up an SD Card with Rmenu for Rhea / Phoebe Sega Saturn ODE

Rhea and Phoebe are Optical Drive Emulators for the Sega Saturn. They replace the optical disc drive with an SD Card reader which allows the loading of game images. Rhea and Phoebe do not come with a menu to load games, instead the devices rely on a button which when pressed cycles through the games one by one. Luckily a menu was created by a third party to allow a more straight forward way of selecting a game image. This guide will show how to set up an SD Card with game images and install the RMenu interface.

1. SD Card Formatting

Format your SD Card with a good Fat32 Formatter. Some formatters have been found to not detect some special hidden windows partitions. MiniAide Fat32 Formatter Home Edition is recommended. Do not use windows built in formatter.

Settings: Primary Drive, FAT32, No Drive Letter, 64KB Cluster Size.

(It might be worth testing performance with both 64kb and 32kb cluster size to determine the best option)

2. Disc Image Preparation

Prepare games. Compatible disc images are CDI, CCD+IMG+SUB, MDS+MDF, ISO (games with no audio tracks and homebrew). CDI and CCD+IMG+SUB are the most widely used formats.

3. Disc Image Transfer

Use GDEMU SD CARD MAKER and drag the game folders into the software. Disable Menu, VGA and Region options. It will fail to add games with problems when dragging them across to the SD Card. Add an empty folder at the beginning. Then save.

GDEMU SD Card Maker will work its magic after pressing save.

You should now have an SD Card with all the games on and an empty 01 folder at the beginning.

4. Rmenu Setup

Drag Rmenu to the first folder on the SD Card. Only drag contents of 01 folder. 01 to 01.

Disable any protection that could isolate unknown programs from running, such as an antivirus, as this could potentially block RMENU.exe from working.

Run RMENU.exe from the SD Card’s 01 folder.

The process will be quick. Once complete you will be asked if you want to edit the game names displayed in the menu, type y or n.

If you type y. Edit the names in the document that opened and then file > save, then close the document. RMENU.exe will end automatically after this.

You should now see RMENU.iso in folder 01 on the SD Card.

5. Rhea /  Pheoebe Settings

The last thing to do is to include a Rhea.ini file. Create this file in a Plain-Text editor such as Notepad. Make sure that Windows is showing file extensions otherwise you might end up with a file called Rhea.ini.txt which will not work.

To show file extensions in Windows go to Tools/Control Panel > Folder Options > View, then make sure ‘Hide extensions for known file types‘ is not ticked.

Include the following in the Rhea.ini file.

open_time = 500
detect_time = 250
image_tests = 1
high_speed = 0
auto_region = 6
auto_freq = 0
reset_goto = 1

Drag this file to the root of the SD Card.

For details on ini values, visit –


Originally written: 03-11-2017