If you have the USB 2/3 ports available most all external writers/players will work just fine for you. I am running a 5.25 inch internal Blu-ray burner installed in an external enclosure on my Dell laptop right now and it works great. The slim-line burners which are 2.5 inch drives enclosed will almost always require two USB ports since they not only transfer data but also draw their power from the ports.
If you look around you will find several external writers that have their own power supply and those will only require one vacant USB port.
Hope this helps you.