Macbook Optical Drive Noise

I just got my black Macbook last night from the Apple store in King of Prussia. I am very happy with the machine and I am amazed at how fast it is, especially booting up. When I turn the Macbook on or when I open the lid from it sleeping the optical drive seems to play a little tune, I know it sounds weird, but it actually is. It kind of sounds like when it takes a disc in but it has a little pattern to it. Is this normal or has anyone else had this happen to them?

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http://www.mac-forums.com/forums/showthread.php?p=219904#post219904