HGST Deskstar NAS 10TB: SMR or PMR

I have been unable to find any technical details about this anywhere online. I emailed HGST support, but they never responded. I think it’s a pretty simple question: Is the 10TB Deskstar NAS SMR or PMR? I am planning to upgrade one of my Drobos and they do not support SMR drives. Right now, the HGST is about $20 less than Seagate Ironwolf.