Actually ALL of them have had 7200rpm drives as I always buy the best spec available. That includes one of the first Core Duo MBP's and two models since - one 15" and one 17".
So essentially if you don't agree with someone that makes them 'wrong' does it?
How else would you suggest I 'prove' it to you? Three previous MBP's prior to the unibody models. No hard drive noise with any of them. Nor has anyone I know that had a previous model MBP. Conclusion - either the design of the new machines lends itself to more drive noise, or I've had two consecutive faulty drives. Which one seems the greater possibility?!
And I guess everyone else posting experiences of noise, among the dozens of other faults with this series, are all hallucinating as well?