WD made a mistake?

[Think]

I'm only testing my velociraptors, I don't have the Black Diamonds.

Here are only HDTach test results using short, long, with and without Volume Right Back Cach enabled.:

1. 1st is short test with NO right back cache
2. 2nd is long test with NO right back cache
3. 3rd is short test with right back cache enabled
4. 4th is long test with right back cache enabled.