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Originally Posted by burningrave101
http://www.storagereview.com/article...otebook_7.html
According to those tests the 7k100 did slightly better then the 7200.1 in the idle noise department although they said it has the slightest hint of a high-pitched whine which they also said takes quite a bit of concentration to notice.
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Idle noise is pretty much irrelevant in both cases, since it's just about imperceptible, unless you are sitting in a sound-proof chamber. It's operating noise where the Seagate shines. I have both of these drives (in two different laptops), and the difference between them is very significant. On the other hand, even the Hitachi isn't exactly noisy, so I don't think this should be a deal-breaker for most people. Also, in my experience, the Hitachi does seem to be just a tiny bit faster than the Seagate (just subjective impression, not a benchmark result), but again the difference is so small that it shouldn't matter much.
P.S.: Notice they measure idle noise from a distance of three millimeters (about 1/10 of an inch) from the hard drive...