There is already an SD card drive for the Saturn.
https://gdemu.wordpress.com/
To achieve this did not require fully reverse engineering the cdrom controller but it is great someone did though.
To achieve this did not require fully reverse engineering the cdrom controller but it is great someone did though.
The nice thing about this new solution, even ignoring that it furthers public understanding of the hardware, is that it's a simple module that plugs into a slot already available and accessible on every Saturn ever sold by SEGA (presumably it won't work on the Hi-Saturn units made by Hitachi, as they had the MPEG hardware integrated, though they are also very rare and very expensive).