You are incorrect about the size. It is a 1Mbit cartridge, The first file I uploaded was the entire cartridge. The second file was the cartridge, plus the empty space that was left in the megadisk's RAM, which is 16Mbits. My cartridge may just be empty, if there is no data in the files. **EDIT** I got a Sega CD today, and it confirmed my fear. The ram cart wasn't just empty, it wasn't even formatted! It took the format well, and I copied-over a few saved games, that were on the system's memory. I will dump it again a few times, so comparisons can be made between when the cart is empty, and when it has a game save on it.