Below is a  Linux Folding Smartphone with                            built-in DVD-RW Player which can unfold to a                       15.6 inches Tablet   or  a  17 inches  Tablet 

The above picture is for illustrative purposes only .  Linux Folding Smartphone ( when  folded it look like a Smartphone  and when unfolded it look like a 15.6 inches Tablet or a   17 inches  Tablet ) with built-in DVD-RW Player which can unfold to a  15.6 inches Tablet or  17 inches  Tablet .

Above is a  Linux Folding Smartphone  , which  consists of two display parts and when unfold it become  a  big Tablet , a 15.6 inches Tablet (15 inches Linux Tablet ) or  a  17 inches  Tablet (17 inches Linux Tablet ) .

Because of the   15.6 inches screen size (when unfolded) , because of the  15.6 inches form factor (when unfolded)    ,  I  prefer to use this phone (Linux phone)  more like a  15.6 inches Linux Cellular Laptop 1 ( when connected to a wireless/bluetooth   keyboard and a  wireless/bluetooh    mouse  it  can become  a  PC/Desktop/Laptop ) . When I commute , standing on a  crowded train , on a crowded tram , on a crowded bus , I prefer to use it as a  15.6 inches Tablet , because it is easier to pick up phone calls when using it as a  Tablet .

Since the 15.6 inches Smartphone is a dual-fold design and it consists of two display parts , it is possible to put or squeeze a DVD-RW Player on either side of the display . The diagram above shows a DVD-RW Player on the Right Hand Side of the display of a Linux Dual-Fold Smartphone which has been unfolded into a 15.6 inches Tablet . 

Since the Linux Smartphone have a built-in DVD-RW Player , the Linux Smartphone is a bit thicker than normal , the Linux Phone is slightly thicker than normal but this is logical because of the thickness of the DVD-RW Player . Anyway , having a Linux Smartphone with a DVD-RW Player built-in , is very useful and very handy especially when the Linux Smartphone ( after it transform into a  15.6 inches  Tablet ) is sitting on our lap when doing software installation , software archiving , burning DVD's , backing up videos and home movie collection , etc., etc. 

Do we still need an Optical CD/DVD Drive ? In my opinion , we still do , 

regardless whether it is on a  Cellular Laptop , or on a Cellular Tablet or on a  Folding Smartphone ( especially on a Folding Smartphone with a dual-display design or dual-screen design whereby a   hardware/software  manufacturer can squeeze  a   slim/sleek   DVD-RW Player inside a Folding Smartphone if they wishes to ) whereby each and every one of them are qualified to be a true or a real           [ Laptop/Tablet/Smartphone (ALL-in-ONE) with built-in DVD-RW Player ]  machine

The above picture is for illustrative purposes only .   Linux Folding  Smartphone ( when  folded it look like a Smartphone  and when unfolded it look like a 15.6 inches Tablet or a   17 inches  Tablet ) with built-in DVD-RW Player which can unfold to a  15.6 inches Tablet or  17 inches  Tablet . 

Above is a  Linux Folding Smartphone  , which  consists of two display parts and when unfold it can become  a  big Tablet ,  a    17 inches Tablet .  The DVD-RW Player ( because of the 15.6 inches or 17 inches screen size or form factor , because of the dual-display  design ,  because of the dual-screen design , the DVD-RW Player can be squeezed inside the  Linux Foldable Smartphone )  can either be on the Left Hand Side of the Display or  on the Right Hand Side of the Display located on the top horizontal side of the Display