Generally 7.2 k RPM Hdd - 3.5" plates
Raptors 10 k RPM - 2.5" plates - seek will be allways lower
because it spins faster and the head needs to do less movement to "find data"

Generalized a lot
Never HHD's can overburst rate raptors maybe overspeed it
But Raptors are Raptors , and Raptors in Raid 0 are destroyers (:

Btw i hate partitions, just get a customizable defragmenter and order him to put data on the "fastest line" that's all