Seven games fill up your HDD? Please!
Just like on any other system, game saves are in the kilobytes. So that means that it's take just a few games to make ONE megabyte.
Still, XBL Data takes up a lot of space, so it's not recommended for just a little memory stick. But if you just want to play all the great single-player games (Dead Rising, Blue Dragon, ect.), then this is still the best deal you can get.