If you've bought RED drives before, the new 2020 Red's have been downgraded. If you want the <2019 RED, you need to buy 'RED PLUS' now. I put this in my Synology NAS and after two days it was still rebuilding and then I started Googling and found out about the downgrade and re-labeling. I returned and got a RED PLUS (for the same price no less) and my array was rebuild in <3 hrs. These are garbage.