I have a RGH console, and here is how I got multi-disc games working-
1. Install FSD. This can be done by editing Dashlaunch ini files. Dashlauncher can be accesed from Xex Menu. Dashlaunch is a separate package and can be copied unto a USB drive, to be accesed from Xex Menu file manager.
2. FSD files should be on internal/external HDD. The path to FSD executable should be in Dashlaunch INI files.
3. Once you have FSD configured properly, just use 'copy game' functionality to copy multi-disc games in this way-
HDD DRIVE\Game Folder\Game Name-Disc 1
HDD DRIVE\Game Folder\Game Name-Disc 2
I have this setup , and it works fine for Max Payne and BF3.