Other than capacity, hard drive technology hasn't moved much in the last few years. I think the results seen above show that to be a rather narrow view. While drive speed in RPM hasn't budged other than the introduction of the Raptor from Western Digital, the actual application performance has sped up quite a measurable amount. Hitachi, with their 7K250, accomplishes this by using 80GB platters (common for most modern ATA HD's), and I'm sure some interesting seek algorithms. Relative to a drive which was among the performance leaders almost three years ago, it leaves it quite far behind, especially in the HD limited parts of a DivX conversion.
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