Seagate might not have been the first to reach the next terabyte milestone -- Western Digital holds that distinction -- but the company can claim the fastest 2TB hard drive on the block. Like WD's 2TB model, Seagate's Barracuda LP sports a slower rotational speed than performance-oriented drives in order to cut back on power consumption and save energy. Only Seagate didn't scale all the way back to 5400RPM, a long-time standard among low-power drives, and instead put the breaks on at 5900RPM, giving it a slight advantage over the competition. Rotational speed aside, how do the two stack up on paper?