i had the same problem, too noisey and just a real pain, and my friends were quiet.. took it back to the shop and got it replaced. New one is fine..
they said the soundproofing or somin of the drive was screwed.
AthlonXP 2500 Barton
MSI K7N2 Delta (MS-6570)
Nvidia Geforce FX 5600 128MB VIVO
512MB (2x 256MB) Crucial PC2700
2x 120GB Seagate Barracuda 7200.7 8MB
52x/24x/52x Lite-On CD-ReWriter
550 watt Q-Tech PSU
Superflower silver case
T1 Internet Connection
AOC 17" 7Klr