Very vivid childhood memories of this. You had 1 (total) save slot. So if you booted another game, the previous was deleted.
Played through Shadowrun 4 or 5 times in a row because of that. Sega really was ahead of the curve so many times. Sega Channel, Analog Sticks, KBM+Broadband on DC. (Genesis+CD+32x Stack, lol).
Wonder where they’d be hardware wise if they hadn’t crashed.