Forum:Do i need to keep my discs?

I play fallout 3 on xbox 360 and i have just bought the 2 expansion boxes

(operation anchorage+the pitt and broken steel+point lookout)

Installed both of em, and my "hit me to start"box 360 asks to put the original game back in...

So the question is..

.will i ever need these discs again ?

(if i keep them installed ofcourse)

or can i loan em to a friend to install them too ,and then sell em in a second hand shop LOL :D