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I have one external HD with arch. And computer i am booting it on has windows on its internal HD.
When i tried to figure out what was the problem I installed different os (debian - but only to see if it would have the same problem and it did, then i went back to arch) i also tried another usb3 HD to see if it was something wrong with the first one and after the same results i formated that drive. So now i have one HD with arch.
that is not so simple. you need drivers to be able to use them on full speed and also the box should be able to read/write hdd with the same or better speed. So for example it depends on the i/o speed of that hdd this could be the bottleneck.
I don't think I need your help.
You measured the buffered/cached read/write, but I think that is not what we need. Actually you need to measure all parts and catch the bottleneck (probably a damaged usb cable can do that too).
put a 10G or even bigger file onto that drive and execute a simple time cat file >/dev/null (locally and remotely). You will get some info about the speed of reading. Also you can try to send something "over the line" without using that hdd (or any) just to check the speed of that connection. Probably you will be able to find some tools to do the job for you.