Start up hard disk sound

Hi,
I am a new Mac user and bought my Mac a few days back. When ever I start my Mac book it makes a sound (scraping sound) I guess that is the best I can describe the sound in words :-) before the normal gong when Lion loads.
I have a 15" Mac Book Pro, i7 Quad Core 2.0Ghz.
Everything else works fine.
I went to the Apple Premium store and they said its normal but some other Mac Book Pros I checked did not make this sound.
Any one having the same issue, dont know even if its a issue.
Thanks,
Pezan.

pezan wrote:
Hi,
I am a new Mac user and bought my Mac a few days back. When ever I start my Mac book it makes a sound (scraping sound)
Most likely that sound is from the optical drive.
Check here --> http://support.apple.com/kb/HT1723
Lupunus

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