How do I know whether a drive is designed to be on 24x7? For instance, this article http://www.tomshardware.com/reviews/4tb-3tb-hdd,3183-16.html says of the Seagate ST3000DM001: "However, Seagate didn't design this Barracuda for 24/7 operation." I want to buy a drive that can be left on 24x7 with mixed periods of very heavy and light use. How do I determine that about a drive?