Hard Drive on MBP 15" makes more than normal grinding noise?

I have the new MBP 15" with a fujitsu 320GB hard drive, 5400 rpm. the other MBP that colleagues hhave are quite silent running. They have the 250 GB drives. This newly bought computer's hard drive makes a background noise, kind of a low grade grinding, that is loud enough for me to hear when playing itunes song on half way volume.
Any suggestions? Isa this the norm for the larger hard drive, or should it be as quiet as the 250 GB. The brand is Fujitsu. Is that significant.

Drives do vary in how much noise they make. I replaced a 30 GB Toshiba drive with a 120 GB Western Digital drive, and the WD did run a little warmer and makes a more audible whir, but has worked flawlessly since I installed it. I can barely hear my 250 GB Fujitsu if I put my ear next to the case.
However, I would describe my hard drive noise as a low hum or whir and not as a grind.
For your piece of mind, you might like to try running S.M.A.R.T. Utility:
http://www.versiontracker.com/dyn/moreinfo/macosx/32454
You can download the demo and run it several times for free.
A new drive should show zero errors.
If you can hear it over music, it may well be a grind and not a normal sound. If you are concerned, you might want to run it by Apple or an AASP. In the meantime, keep a good up to date backup.
Good luck!

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