So long story short...
I have NVME KC3000 2TB drive that started to behave oddly (at best).
Specifically, how is it behaving oddly? Other than that test, is there anything unusual about how it's working under normal use?
Thanks for "sector refresher" suggestion.
Clearly the "refresh" works, I've run it for a moment just to see that at start of the disk "speed map" is now correct. I've stopped it because I believe Kingstone should fix it, maybe they will get my drive and analyze rest of the sectors.
I believe also that disk controller should work exactly as this "refresher" if sector becomes slow - not the user, but as workaround it might be ok.
What exactly should Kingston fix? Before deciding if there's anything to fix, we need to know if there's anything functionally wrong with the drive. In my mind, the jury is still out on whether these tests (originally intended for HDs) are applicable to SSDs. I'm not discounting the possibility but I don't want to jump to any conclusions either.
Are you planning to send your drive back to Kingston? If you expect them to "analyze the rest of the sectors" you'd have to leave all your data on it. Are you comfortable with that? Even if you are, I sincerely doubt they'd actually analyze the sectors in the same way you did. They'd just run some diagnostics and it would either pass or fail.
You say you think the disk controller should work exactly like the refresher. Well, it's not that simple. Even if we take the slow sectors at face value, at what point should the controller decide to refresh them? You have to keep in mind that this requires re-writing the data and will consume the NAND's limited P/E cycles (and increase write amplification). If it's done too aggressively, it will greatly accelerate the speed at which the drive wears out. It's a balancing act and it's quite possible the manufacturer has already considered the issue. Even though the speed has degraded a bit, I suspect the drive would refresh the cells before they degraded to the point where data integrity could be compromised.
Back to my original point. it's hard to help unless we know the actual symptoms. What seems abnormal when you're simply using your PC?