I have a 2009 15" Macbook Unibody and for as long as I can remember the superdrive has been making a loud noise when I boot up the machine. Its similar to the noise when you insert a disk. I just figured this was the lens aligning and that it was normal. My brother however works at an Apple store and has a Unibody and his is deadly silent, he also said the laptops he had used at work make no such sound. He said as long as the drive functions then its nothing to worry about. It doesn't happen at any other time, and the drive does indeed function perfectly fine. It just bugs me when I turn my laptop on and hear a loud freaky noise. Just wondering if anyone here has this and what they think of it?