I have two 5+ year old Readynas 6 bay NAS. Max capacity is under 7TB. The drives are a mix of 1.5 & 2TB Seagates. For the last 6 months the drives have been dying of old age at an increasing rate, and I've exhausted my stock of 2TB spares. There's a Netgear Readynas approved drive list, but the only current drive I'd consider is a WD Red WD40EFRX, but it's 5400rpm so would drag the speed down for the enire NAS. Most of the content on the NAS is archive so doesn't change, and the second NAS is powered off most of the time. Any advice for trying drives NOT on the approved list from Netgear? I tried asking the question in the past on their forum but never got a good answer. And I don't need to be told over and over that a NAS is not backup lol... What's the worst that can happen if I go off list? I'd like to get a 4TB 7200rpm NAS/enterprise drive. An alternative is to pick up a single WD Easystore 8TB USB on Black Friday and sync to that, setting aside one NAS for drives and parts. Thanks!