Desktop is cheaper, cause it's a 3.5 inch hdd. 3.5 inch hdds
require a power source.
Go is for people who are always on the go. they norm only
require a usb cable or 2 to power it up, but most prob it can be
run from a power source too
Pro is also one that requires a power source.
Ar i see.. Now i see the difference. Thx. Now have to decide on
Desktop or Go.