We are talking about Blu-Ray mostly, for I have many Blu-Ray videos on my HDD's, but I also have SD videos. The other neat thing about the WD unit, is it lists all the videos alphbetically, so it easy to find the movie you want to play. Plus, it will also play MP3's and CD music. I think it is a great way to play videos, since I don't have to browse through my binders of discs, they are all in one place or two....going on 3. JMO, of course.