My friend has installed Plex.tv on his computer and he has stored several movies on it to try it out. He likes that he can stream the movies to his tv and now he would like a larger, separate hard drive to store the movies. He has a large collection of DVD's. He has a Lenovo 90DA004HUS desktop with an Intel i5 running windows 10. Would it be better to buy an internal or external USB 3.0 hard drive and which one would you recommend? I believe he plans on leaving the computer on all or most of the time. Thanks.