Is my Recovery USB drive working?

Apr 7, 2016
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I installed win10 over my old win10. That went ok.
Then I created a Recovery USB flash drive of system. I think it went ok. (took over 10 Gb)

Then I turned off computer with USB disk in it.
Turned on computer and Pressed F12 when Manufacturer's logo appeared ( Dell)
Sure enough the Boot Manager found the usb drive. I selected it for booting.
Lights flashed for a while, then my windows sign in menu appeared.
How do I know if the USB is useful if my system crashes?
I would like to know the explanation.



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