You should see a device disappear from System Information when you remove the USB device, and it should appear again when you reconnect it. Wait a few minutes, and click File > Refresh Information.
Open System Information and disconnect the USB device from your computer.If you install a new USB device and Mac OS does not detect it, you can complete the following tests to identify the issue: Click About This Mac > More Info > System Report.
To open System Information, complete the following: You can find the name of the chipset by navigating to, searching for the product ID, and clicking the Technical Specifications tab. And work it did, and very well I might add. I had no idea if this would work and crossed my fingers as I rebooted Windows 10. Then I tried the StarTech USB 3.0 Ethernet adapter plugged into the StarTech USB 3.0 ExpressCard. The USB device is displayed in System Information, under the name of the chipset. I tried a USB 2.0 ethernet adapter, but speeds were about the same as Wi-Fi. Examples of appropriate headings for a USB video adapter include 'USB without the driver installed' or 'Graphics and Displays'. To determine if Mac OS detects your USB device, you need to open System Information on your computer to see if your USB device is listed under the appropriate heading or is listed with an error (for example, 'Device has not been configured').