The wonders of technology, most of us know what they are supposed to do, but have you ever wonder how do they work? In this video Bill Hammack (a.k.a The Engineer Guy) engineer and professor of the University of Illinois-Urbana, came out again with an awesome new video called Hard Drive Teardown in which explain us in great detail, with graphics and narration, how a hard drive works and all its important parts. Plus he also explain briefly the mathematical technique use to allow engineers to increase the capacity of hard drives.