I'm sorry... but what is up with that autor's opinion? It uses less electricity with the slower rotation speed? Really?
I mean, first... you didn't include this hard drive in your maximum power usage graphs for the 7200 rpm drives yet. That said, how much is a 1.8 wat difference worth? How much will it really extend the life of a notebook?
I find the results of the maximum power consumption graph interesting though... what was used to determine that? Was the exact same notebook used for all drives?
I just seem to remember an article on tomshardware or anandtech where they were comparing 4200, 5400, and 7600 rpm drives, and found almost no difference in power consumption. The conclusion was that there was no reason for 4200 or 5400 rpm drives at all. Can't seem to find the link though...