Maxtor's drive is pretty zippy, but hasn't been tested at SR. WD's hasn't either, and their 400GB drive is pretty zippy in its own right. The 7K500 is the fastest 7200RPM drive SR has ever tested, but both WD's and Maxtor's 500GB drives look to be substantial improvements over their predecessors.
More than likely, it'll be a logjam at the top between WD, Hitachi, and Maxtor with Seagate trailing by a pretty significant margin. That's pretty much how the 250GB round-up shook out.
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