In a perfect world, yes. There's always some waste even on the factory layout. It has always been that way. It's slightly less than 16MB in total on your project so I wouldn't sweat it. Coincidently, the layout that a Roamio TRIES to create on a 4TB drive wastes exactly the same amount of space even though it uses a different partition scheme. That's about 9-10 seconds of HD. The Weaknees 4TB drive only wastes 5MB, so they could probably squeeze out a least 6 more seconds of recording time.