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. If you install a new USB device and Mac OS does not detect it, you can complete the following tests to identify the issue:
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. The USB device is displayed in System Information, under the name of the chipset. 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').
