I'm looking for a dvd burner and would prefer one with USB 2.0 connectivity so i can use it with my laptop if needed, as well as my desktop (not to mention i can take it with me anywhere else i would want to use it). But my question is, do internal DVD burners have any benefits over external ones? More or less features, speed, etc? Any recommendations? Also, do all burners also act as a regular cd/dvd drive so that i can play movies and music, in addtion to ebing able to burn copies? Thanks!