I'm guessing when you say 'GB' you mean 'TB'? I've got a 500GB Buffalo drive and they come with some Turbo drivers and they seem to make a slight difference to the speeds. If you're using one for your router, and your plugging it in, make sure it's capable of powering the hard drive, my old router was only able to power flash disks and not large hard drives. Otherwise get a AC powered one (most desktop external drives are).