I've transferred two tb to it so far and it's not making any sad sounds or being weird. I was just gonna plug it into the USB on the DS923 and use hyper backup, but now I'm wondering if I should just shuck it as it seems the odds are in favor of it being an Exos or Iron Wolf branded as a Barracuda (my eyes are killing me from all the comments I've read). I have a DS220+ laying around collecting dust and it's only purpose would be backing up my DS923. I have two 20tb IWP and two 8tb IWP in the 923 and I'd love another 20tb in there, but not with this drive and I don't need the space yet. As a backup though? Seems like a win. I'd get to spool up a spare NAS I could maybe move off-site one day, and I'd get better monitoring as opposed to an external device, too.