The hard drive on your Xbox 360 is the optional storage device which stores all your saved game progression, music, pictures and games.
saving games, storing music, game demos, pretty much everything. It's like having a giant memory card
The hard drive is used to store game info such as story progress, replays, photos, demos etc.
No, you just won't be able to save anything.
no
yes you can but only if you have a hard drive
You do need a hard drive to download expansions, but the system won't turn on if you don't have a hard drive, so if you can turn it on without problems, and can play games then you definitely have a hard drive and you are able to download expansions.
yes you can
no they are not inchangeable
Simply remove the Elite hard drive from the Xbox360 Elite and insert it into the Xbox360's.
Yes. You will need to buy a transfer cable.
it is the version of the xbox360 which has a 120gb hard drive and is black instead of white
the 360 elite comes with a 120 gb hard drive and its black but the normal 360 comes with a 60gb hard drive and its white
One comes with no hard drive and one has 120GB hard drive.
No. You do need a hard drive to play Grand Theft Auto 4. However if you want to purchase additional downloadable content such as "The Lost & Damned" or "The Ballad of Gay Tony" this will require a hard drive.