Hdtune readings through external adapter?

I have an extra hard drive that I've used as storage using a docking device. The device is limited to a 2.0 connection. I'm wondering if this might comprimise the results from my hdtune test. I know the error reports will probably work ok but the read write ones (with the graph) might be limited to the usb... show more I have an extra hard drive that I've used as storage using a docking device. The device is limited to a 2.0 connection.

I'm wondering if this might comprimise the results from my hdtune test. I know the error reports will probably work ok but the read write ones (with the graph) might be limited to the usb speed and not give a reliable reading?
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