The highpoint cards we use are old ones just for clone RAIDs of our master units. I wanted to rule out the issue was the drives or Areca/enclosure. I only tested 6 drives with highpoint and was able to copy files. So something off with the Areca system or Thunderbolt bridge in compatibility with these Seagates.
In any case, after talking with 4 Seagate technicians since December I'm convinced they have no idea what this drive is for. They all said,before I bought these drives and before your review, for my purpose it should be ok. That I can RAID them. Just performance would suffer, which I didn't care about since backup was over the internet. But after reading your review and the fact these are a brand new class of drives, using SMR technology, I don't want to be a tester for them. Find out in a year or so that data is corrupted, slows down to a crawl or some other catastrophe. I'm going back to HGST 6TB drives for now. Let the future sort itself out with me being the guinea pig.