I have a brand new HR44-500. Got it just yesterday, Oct. 1, 2013. However, I'm not too sure if the external HDD is being used since it comes with a 1TB HDD. How can I tell if it is being used, besides calculating how much percentage is left after recording a few movies? It's a 4TB HDD. The external HDD was turned on after being connected to the HR44-500 and then the HR44-500 was turned on for the very first time. Downloaded all the software and such. Would it use the external for all that?