@sgtjimmyrustles It wouldn't really work on RetroPie as easily imho. Recalbox system is a fixed size. RetroPie is a full OS which needs to sit on the ext4 filesystem and can grow. We wouldn't know how much to split between the system and roms partitions - not everyone's use case is the same. Some people might want to add lots of addition stuff to the OS.

Even if this was an initial configurable setting on first boot, I don't really like the idea sorry.

Also, I think it's easy enough to transfer ROMs. You can copy directly if you install an ext4 filesystem on windows.