Lately I came again in "touch" with the Megadrive, as I installed the emulator on my JXD7300, along with a bunch of games. Unfortunately I don't know a lot of games for it. I also never owned one, at least I think

Always got confused with the naming, as I had 2 different sets, one for Megadrive, and one for Genesis. But one time I thought there was something fishy, then I cross checked the sets, and noticed that they're exactly the same, only the extension being .md for Megadrive, and .smd (or even .gen) for Genesis.