Help me understand what's going on here: Normally these graphs start high and roll-off towards the end because hard drives "start" on the outer edge of the platter and work their way inwards, and the angular velocity of the platter decreases as the reader arm moves inwards. In theory, if a hard drive were designed to "start" at the inner edge and work its way to the outer edge, I would expect to see a graph that rolls-off to the left instead of to the right. (horizontally-inverted.) But this graph is vertically-inverted -- it doesn't roll-off, it rolls up. What the hell would cause that?