It follows logic, really. Western Digital has a 2TB hard drive, so why not shove that very drive into Western Digital’s line of external hard drives? This week, WD has expanded its popular My Book family of external HDDs to include a 2TB capacity, the largest available capacity in a single-drive system. Specifically, the new 2TB My Book family includes: My Book Studio Edition, My Book Mac Edition, My Book Home Edition and My Book Essential Edition models. Sure, 2TB isn’t all that much bigger than 1.5TB, but