Look again at my op and notice that I also tried internally via sata and saw the same results.
Anyway this can be marked as closed since I already took the drive back. This was my first Seagate drive and I think I will revert back to brands I've used and had good luck with. Most likely will go...
Just got a new hdd. Seagate BarraCuda 4TB (ST4000DM004}
Before I installed it internally, I formatted it in a usb dock and ran crystaldisk mark to test the empty drive.
Then I started to fill the drive and after filling it a tiny bit wanted to test again.
As you can see the 4k writes...