Loud louder loudest
I installed a 7200.10 320GB and it is loud. I do a lot of testing with computer stuff and Seagate claim that this quieter then the 7200.09 is nuts. If you like the WD74 noise you'll love this one.
HD Tech shows it fast but the noise is very loud.
I had planned on buying 2 more but now I'm thinking of returning this grinder