Swapping discs or mandatory installs? What's worse?

[Impulsivity]

I'd say swaping discs. I mean just buy a 80 dollar 320GB drive, install once, and never worry about it again. I just put it in, it installs while I get a drink and a sandwich, by the time I'm back 9 times out of 10 its done. It's not like a PC install where it takes 30 minutes, it takes 10, tops.