Xbox 360 Hard-drive help?

I have an Xbox 360 Arcade with a 20GB hard-drive attached to it. I heard if you have a hard-drive you can some original Xbox games.



I was looking at some cheap Harry Potter video games that were made for Xbox. I'm thinking about ordering them online but I wanted to know first if they would play on my Arcade.



I think I heard somewhere that not all Xbox games can you played on your Xbox 360 Arcade with a hard-drive attached.Xbox 360 Hard-drive help?
Xbox 360s just dont play ALL xboxs games, but they do play some. Check their website for a whole list. It has nothing to do with a hard-drive.Xbox 360 Hard-drive help?
It's true,not all 1 xbox games can work the the 360,here's the list of compatible games.