You can put a copy on that drive and you are done. Maybe there is more to that requirement such as it must play on some Flavo HDTV USB port but that's not in your post.
So it's rather simple. Copy them there and use them.
And in parting, only the new folk would put them on such a drive without having a backup copy. You can find those folk in the CNET Storage and other forums asking "How do I recover my files?"
I buy a lot of movies and would like to put them on an external hard drive for easy watching and safe keeping. Can you tell me the programs I would need and which one you recommend. I have a 2 TB ext. hard drive and over 400 movies.