Additionally, and in answer to the OP... the benchmark button is merely an I/O test, giving you an overall idea of how fast your system can get data off that particular drive, based on it's current status. USB drives will read different numbers, based on the USB interface it's connected to, i.e. 2.0 or 3.0.
It really means about as much as the Windows Experience Index. It's for your machine, at that moment, and may or may not change each time you run it, based on drive fill, drive activity, CPU overhead, overall computer activity...
It's really pointless to worry about it. It's possibly handy to help you see how fast one drive might be versus another drive in your PC, but it's just a number.
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