I remember my pre-unibody MBP's SuperDrive had made a loud noise when it booted up. I then got a 2008 MBP and either through a firmware fix or something, it was never really loud any more. With the 2011 MBP, the behavior seems to have reverted back to a loud eject sound when booting. Is this what all of you are seeing as well? If it's a driver/firmware issue, I'm not sure why Apple went backwards on this.