I have what maybe a silly question. I have 2 Dual Hard Drive Trays in my B&W, and my question is, why is the top of the dual tray not lined up with the bottom? If I put a normal 3.5 HDD in the top slot, then I would only be able to screw in two of the screws on one side of the HDD. Is there a reason that it is offset like this? Both of my dual Hard Drive trays are like this, and I was just curious about it.