I actually purchased 2 20TB WD HC560 and received them today. They're marked on the drives as "manufacturer recertified" and they come with a 2 year warranty from ServerPartDeals. I'm currently running extended SMART tests and other tests to make sure there are no bad sectors, etc. The only complaint I have so far is that they're a little noisy but the dates for the drives show Feb. 2024. I'll circle back around and if they have any problems. I'm going to be using them in a DS1621+; previously I shucked WD 10TB Elements for my last NAS in 2019 and I've only had one drive go bad in all that time (which was outside the 2yr WD warranty anyway). Hopefully these are just as good, they carry the same warranty (albeit from ServerPartDeals).