[originalscottyg]

Most likely the HD Driver is being blocked by macOS security settings. Go to System Preferences->Security & Privacy->General and see if there is a prompt to allow the driver to run. If not, you may need to reinstall it and keep a look out for a pop-up window asking you to allow the driver access to the system. There have been a few threads of people that were having problems with the system not showing the pop-up, or giving the prompt to allow the driver. A search of this forum should turn up some additional info and advice if that's the case.