It depends what type of xbox you buy.
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each game is around 1 or 2 gb so it can hold alot
It has 10 gigs
That certainly depends. You can buy an xbox 360 with 4 gigabytes for about 200 bucks, or a 250 gigabyte xbox 360 for 300 bucks. So if you want to play a lot of games on your xbox 360, you should get the 250 gigabyte one.
How much can the XBOX 360 20GB hard drive hold?
Go On System Settings and Go on Memory