I don’t have any hard drives less than 10 TB. I have to use a media player called MICCA to play things from it. For the most part works, but it’s slow and it’s crummy, but at least it works for most everything. Roku should be able to handle any external in any formate and any size. It should have an option to sync the content on there to some sort of database the way they do in Plex. That would be cool