But if they were professionals didn't they use SAN (or at least NAS) for this ?
Don't get USB hard disks old pretty quick ? (and the performance with GByte LAN is much bigger). So it's just a single LAN cable ?
I suppose it depends whether you consider Pro and Enterprise to be synonymous. I don't think they are.
Anyway, what kind of high end Mac user ever bothered with USB drives, when you could use Firewire and have double the throughput with no CPU overhead?
It's mainly non pros that argue that a few internal 2TB bays would be enough, which is laughable for pro use.