The latest xbox 360 E 250 GB has a different DVD Disc drive to the Xbox 360 slim.
It not only looks different it operates differently, the disc tray moves smoother and it makes a Grrr sound just before it ejects and also after about a minute when the disc drive is idle if it has a disk in it --- check out my other video.
Is this faulty? Or normal For the DVD drive to make ther Grrr noise?
The first production Run of xbox 360 E's had the same drive as the Slim see Link http://www.youtube.com/watch?v=wo-zvx1PARM