Metallic scraping sound when booting Mac mini

Hi,
I just bought a Mac mini last week, and I've noticed that when I start it up, there's a sequence of two metallic scraping sounds coming out it when I start it up. I'm guessing that it's some part of the optical drive mechanism checking to see if a disc is inserted (there isn't a disc in the drive), but the noise is much louder than I've experienced when booting any other Mac or Windows machine that I've used. Is this normal, or is this something that needs investigation? If it matters, I have Boot Camp installed, so Snow Leopard is on one partition of the hard drive, and Windows Vista is on the other. The sound occurs regardless of which partition is set to be the boot partition.
Thanks,
Ken

Hi,
Thanks for the info. I confirmed at one of the Apple Stores near me that the sound is exactly as you described it. I agree with you, this is the noisiest optical drive that I've ever heard, significantly louder than the sound that an empty floppy drive makes when booting a Windows machine.
Thanks again,
Ken

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