4gigs? I only have a 800mb seagate drive connected to my A1200. :-D
Most I ever used was a 1.4gig quantum harddrive.
I think the reason why most people use larger hard drives is to store music, movies, or maybe large amount of picture files? Even then, I have a heck of a time filling up my PC with music since I have all the ones I listen to, and barely fills up 1.2gigs. :-)