Many but not all will have a ‘total TBW’ metric, but that is more of a ‘how many write cycles can this theoretically last’ metric. What I am predominantly interested in is “how many TB can be written before sporadic write delays start occurring”
The thing that is always painfully missing from any benchmark, is an endurance test.
I want to know how many TB I can write consecutively before the disk starts to degrade in performance and stop being useful. So far the only way I have been able to achieve this is to purchase a couple of every disk and stress them until failure, logging that interval, and selecting the winners for usage.
I do not care about how fast it can write over the course of five minutes, I want to know how fast it can write over the course of five hours continuous usage.
To clarify, you have a dongle paired with this keyboard permanently attached to the machine?
To get a step deeper into your “how can a machine draw a circle” question. Mostly it can’t. Even with an open-loop control system dragging the ‘pen’ at a fixed angle, you would need to have defined that curve in software somewhere, where it will be a barely-noticable set of X-Y steps, not a pure curve, otherwise you cannot be sure it would return to the origin.
Luckily, you only need a few decimals of pi to approximate that far beyond what any human eye could discern.
Break any digitally defined curve down far enough and you will see those discrete steps, but with modern technology, we just never notice it.
That answers my question. If the USB dongle never disconnects from the machine, then I wouldn’t expect anything to show in dmesg, as the ‘sleep mode’ is likely occurring downstream of the USB dongle.
Are there any config utilities that came with it? Failing that, maybe wireshark the dongle and see if there is any sort of sleep/wake signal being passed back through to the host machine?