I'm still looking for FlexRaid's feature that spins down the hdds automatically when not in use. I can't seem to find a definite answer in forums though some swear FR spins down hdds automatically. I think it's more of a controller function. Also read that Windows got some bug or needs an updated driver to make it work. Needs more reading on this. I still have time as haven't received the hdds yet.
Something new to learn each day. =))
I'm wondering about this feature as well. Please let me know what you find!