Funny, I just shipped 2 of those NIB to another member who snagged them from my sale thread
If I didn't have to worry about electricity cost at home, for idling my storage drives most of the time I'd have gone with performance models... all RE or Ultratars... heck even the HGST 4TB NAS idle at 7w compared to the WD RED at 3.3 and full-power 5w or less the HGST are power hungry... compared to the WD RE they're saving power
though!! 84w idle vs 40w (HGST NAS vS WD RED) saves me almost $100/year in the lower power tier, I can't imagine spending more than $100 for all RE... although wish I could warrant the need for high-performance spinners
I went from 5x2TB RE/SE to 6x5TB RED and 2x2TB RED PRO. Likely swap-out the pro and swap-in 2x more 5tb reds...
Keep an eye on 5TB models for a bit more per-GB as they fluctuated up/down over the last 17 months. You get a bit more performance even on the RED lineup with the larger drives.
You could just get some HGST Ultrastar SAS and