Bought this kingston xs2000 a while ago. It’s officially rated for “up to” 2000Mb\s read\write but slows to a crawl after 30GB have been copied. Fyi, I’m copying files from an internal nvme (samsung 980 pro) via a usb 3.0 cable, so this kingston ssd is the only bottleneck.
I know how most of these things work, but thank you for the detailed description. Still, 30MB/s is unacceptable.
If USB was the bottleneck it would be 80MB/s. I get 80MB/s from my SD card over USB in my 11 year old PC.