Putting the [ 15.6 inches  Linux

           Laptop/Tablet/Smartphone (All-in-One) with

           built-in  Ultra-Slim  DVD-RW  Player ] on

           the  lap is SO MUCH MORE CONVENIENT than having

            a  [ 15.6 inches  Linux  Laptop/Tablet/Smartphone (All-

            in-One) ] with an  External DVD-RW Player  connecting

            to it  ,   regardless whether it has the physical   appearance of

            a :

                              1.   Laptop(foldable 360 degrees/detachable)
                              2.   Tablet ( a  15.6 inches  Tablet )
                              3.   Smartphone ( A folding smartphone which can unfold into a

                                    15.6 inches  Tablet )