Nothing wrong with ultra high speed grid,.. but currently we do not have the technology to 'Write' 80gig in 5 seconds. The only way we can come close is to do direct dump from grid to RAM. (and I'm not even sure our current through-ports to RAM can transfer that fast) So unless the target computer has like a few thousand gigs of ram. The HD is going to be the deciding factor on how fast you can receive data.
..But it is nice to think about those kinds of speed.
Cheers!