Okay, so it took the 6Tb drive happily enough, but I'm now having massive issues with FreeNAS. I've spent two whole evenings trying to get it to work, with no luck. In Network I can see the server (called FreeNAS), and one directory inside "homes" - curiously, I've not made any such directory, and FreeNAS describes the directory as follows:
mnt>Default>Steve
I can never see Steve, and I can't mount anything (Steve, or homes) as a network drive. I can't access any, despite wasting hours messing around with user profiles and guest profiles, and I've double checked that CIFS was turned on a dozen times.
Pulling my hair out now. Has anyone else had similar troubles using FreeNAS with Windows 7?