Anyone of a certain age remembers being absolutely blown away when the first 100GB hard drives hit the market in the early 2000s. So much space - how could we possibly fill it? Today you would need several of those 100GB hard drives - 1,400 of them, to be precise - to equal the immense capacity of this Western Digital Elements 14TB external hard drive that's selling on Amazon right now for just $170 in a killer Prime Day deal.