Can a 360 with a flashed drive play any game?

Hi, a friend of mine recently let me borrow his 360 for an extended period of time. I've no idea how, but it can play pirate discs, and my best guess is that it's drive has been flashed, since there's no evidence of internal modding.
So, I aquired some discs, and burned a game correctly on my first try (Metal Gear Rising), but every other game I've tried has failed. Mind, I haven't tried many games, so I'm wondering, is there a list of games I absolutely cannot burn or is it just me making a mistake somewhere along the process?