Max sustained read or write on a WD Black 1TB is 113 MB/s.Originally Posted by jalyst
Max seq read on the X25-V is 170 MB/s, and max write is 35 MB/s. So a pair of them in R0 could be almost three times as fast as the HD in read, but only about 60% in multi-threaded or large block writes.
Most disk access patterns are heavily read-weighted, and more random than sequential -- so unless you're doing something particularly write-heavy, you should be better off with the SSDs than the HD.
It can improve sequential too; the maximum sequential data rate is higher toward the outside edge of the drive. Here's a graph I did that shows typical HD sequential performance as a function of position:
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