It’s been nearly two years since we saw the first 2TB drives hit the market. You’d think we would have gotten 3TB drives months ago. It’s not that hard, is it? Turns out, it’s pretty complicated. We’ll get into all that in a second, but in the meantime, here’s what you need to know: Western Digital’s new 3TB Caviar Green drive is the first internal bootable 3TB drive to hit the market. It’s not the first 3TB drive—Western Digital and Seagate both have external versions—but it is the first bootable 3TB drive.