The safest way to flash the cartridges is to use a Saturn that can read backup games, such as modchipped Saturns. The alternative way is to use timed disk swaps while the machine is booting up, personally I leave disk swapping to club DJs. So I used my modchipped Saturn to flash the cartridge.
Relatively painless and the process takes about 15 to 20 minutes. Everything is navigated by the joypad and important steps involve multiple button presses to ensure the user do not stuff the process up.
Upon booting a CD-R, the Saturn will cycle through the boot up screen, the SEGA splash screen, then it will go to a specific code screen where it will detect the Saturn game and allow the user to boot it up manually.
The game I decided to use also utilises the RAM expansion, has the ability to detect a cheat cart (hence blocking the boot-up) and was a foreign region game (as SEGA region locks consoles) and that game is...
I am happy to report all is well EXCEPT the pseudo saturn does not allow the NTSC signal to pass through, instead it uses the consoles' native video output.So PAL consoles will only output PAL etc.
Some more games I tried:
This was truly an aweful game. And finally I played a bit of Capcoms excellent Warrior of Fate 2 original NTSC-J disk.
Overall I rate the mod to be relevant as there are some games I manage to boot up that would not do so on my modchipped machine.