use all these 3 ports simultaneously to install other Operating Systems (e.g. another version of Linux OS)

Installation of Operating Systems in the PC/Laptop environment can be done in so many ways but  since we want to install another Operating System on the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid then this is the first method . This method is a fresh install of Linux Operating System on a  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid .  Steps that we are going to take on how to install  Linux Operating  System (we take Linux OS Ubuntu 18.10 as an example) on a  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid are :
  
1. we have to ensure that the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid  have  a   
 UEFI/BIOS (software/firmware) on the System Board .

2. we have to ensure that we have  3 units  of full-size  USB 2.0  or  3 units of full-size  USB 3.0  on the  15.6 inches  Linux Laptop/Tablet/Smartphone   hybrid .
Since we are doing a  fresh install of Linux Operating System  Ubuntu  18.10  on  the  15.6 inches  LinuxLaptop/Tablet/Smartphone  hybrid then  2 units of full-size USB 2.0  or  2 units of  full-size USB 3.0  should be sufficient . 
The first unit of full-size USB port (USB 2.0 or USB 3.0)  is  connected to an external DVD-RW drive so that we can insert the Linux OS Ubuntu 18.10 Live DVD to begin the software installation . The second unit of full-size USB port (USB 2.0 or USB 3.0) is connected to and external hard disk drive  or 
flash drive where the Linux OS  Ubuntu 18.10 will reside .
The second method involve hard disk drive cloning and we need to utilize 3 units of full-size USB port (USB 2.0 or USB 3.0)  simultaneously .  If we have a  external hard disk or a spare external hard disk that is already installed with  Linux OS Ubuntu  18.10  and we have another  external hard disk and we  want to install it on the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid , then  1 unit of full-size USB port is connected to an external DVD-RW drive (to insert a  a bootable Live CD like Clonezilla for cloning purposes) and the other 2 units of full-size USB port is connected to the SOURCE hard disk drive and the TARGET hard disk drive .
Note that for both method we use external hard disk drive and we use  Linux Operating System Ubuntu 18.10  .  Installation of other Operating System like  Linux OS  Ubuntu 18.10  or  Linux OS KNOPPIX 8.2 on the external hard disk drive which is then connected to the full-size USB port (USB 2.0 or USB 3.0) of the 15.6 inches  Linux  Laptop/Tablet/Smartphone   hybrid , does not override the existing Linux OS , which is residing , which is powering  the
15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid . 
With the presence of UEFI/BIOS on the System Board of the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid , we can select to  boot from  the  external hard disk drive or flash drive which has been installed with Linux Operating System Ubuntu 18.10  .  To the best of my knowledge , only Linux Operating System Ubuntu  18.10  and  Linux Operating  System  KNOPPIX 8.2  and other Linux variants can be booted from an external hard disk drive or flash drive with the help of  UEFI/BIOS .
Installation of other Operating System  like  Linux OS  Ubuntu  18.10  or  Linux OS KNOPPIX 8.2  on the external hard disk drive which is connected to the USB port  of  the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid  does not override the existing Linux OS which is residing  inside the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid .  The only snag when installing other Linux OS  is , the  15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid cannot make telephone calls and receive telephone calls , cannot send and receive sms , cannot WhatsApp , cannot WeChat , cannot Snapchat ,  cannot  Instagram , etc., etc.  After the other  Linux OS installation is complete and after we have finished doing what we want to do with the new Linux OS , just shutdown the new Linux OS .  Disconnect the external hard disk drive from the  15.6 inches  Linux   Laptop/Tablet/Smartphone   hybrid ,  reboot/restart the 
 15.6 inches  Linux  Laptop/Tablet/Smartphone  hybrid , then we can use the  15.6 inches  Linux   Laptop/Tablet/Smartphone  hybrid  just like an ordinary  Android  Smartphone ,  just like an ordinary Windows Smartphone .  Now , we can make phone calls , we can receive phone calls , we can send sms , we can WhatsApp , we can WeChat , we can Snapchat , we can Instagram , we can watch YouTube/Videos/Movies , we can connect to printers , we can connect to scanners , and a long list of everything the PC/Laptop/Tablet/Smartphone   can do ……..…….. we can also do with our  15.6 inches  Linux   Laptop/Tablet/Smartphone   hybrid .

use all these 3 ports simultaneously for cloning hard disk drive_Linux OS

For the hard disk drive cloning process , 1 unit of full-size USB port is connected to an external DVD-RW drive (so that  we can insert a bootable Live  CD/DVD   like Clonezilla for cloning purposes) and the other 2 units of full-size USB port is connected to the SOURCE hard disk drive and the TARGET hard disk drive .  There are many solutions out there that can clone a hard disk drive without using a PC or a Laptop but if we can do with it a  15.6 inches  Linux    Laptop/Tablet/Smartphone   hybrid
it would be great and it is definitely a bonus . 

15.6 inches Linux Laptop/Tablet/Smartphone ( All-In-One ) which has the physical appearance of a Laptop that is foldable 360 degrees so that it can be turn into a Linux Laptop or a Linux Tablet .

15.6 inches   Linux   Laptop/Tablet/Smartphone ( All-In-One ) which has the physical appearance of a  Laptop that is  foldable  360 degrees  so that it can be turn into a  Linux Laptop or a  Linux Tablet .

Picture above is for illustrative  purposes only .  It is not the actual picture of  a  15.6 inches  Linux Laptop/Tablet/Smartphone ( All-In-One )    which is  foldable  360 degrees .

 Few examples of  360 degrees foldable machine or  360 degrees computer hardware are listed below with different hinges-design  that  the  15.6 inches  Linux    Laptop/Tablet/Smartphone ( All-In-One )   can emulate . 

1.   SONY Vaio Duo 13  13.3 inches 
2.   LENOVO Yoga 500  15.6 inches 
3..    ASUS Transformer 3 12.6 inches 
4.   Microsoft Surface Book 13.5 inches
5.   ZTE Axon M Dual Screen Foldable Smartphone  5.2 inches

advantages of detachable keyboard_Chrome OS

1. when there is an  incoming call  on the  15.6 inches  Chrome OS   Laptop/Tablet/Smartphone   hybrid , the user can detach the keyboard from the  15.6 inches  "Display" and take the 15.6 inches  "Display" with them and walk to another room and talk in private ............ eventhough the  15.6 inches Chrome OS   Laptop/Tablet/Smartphone   hybrid    (which is connected to a docking station) is doing something in the background , for example :

• uploading a 4 GB .iso file or a 4 GB  video file from the Internet
•  uploading a huge file or a collection of files above 10 GB from the Internet
• printing 50-100 pages of documents to a USB printer
• watching YouTube/Videos/Movies/NetFlix/iFlix
•  transferring files from one computer to another using USB port  [ 1 2 3 4 5 ]   (work with Windows OS only)
•  transferring files from one computer to another using Ethernet cable or Wireless
• installation of application software from Chrome Web Store 

2. can operate in true tablet mode. Small (15.6 inches only) , light and entirely free of its keyboard, a detachable  15.6 inches screen makes it easy to complete tasks like accessing patient files while making rounds or taking inventory while walking through a warehouse.
3. when the  15.6 inches Display is detach from the the keyboard , the  device’s core functional hardware or the  15.6 inches  Laptop/Tablet/Smartphone  hardware [ 1 2 3 ]  lives behind the  15.6 inches Screen/Display .  

15.6 inches Display diagonal

Why 15.6 inches ?

doing something

For example , printing 50-100 pages of documents to a USB printer or a departmental printer .

use all these 3 ports simultaneously for cloning hard disk drive_GOOGLE Chrome OS

For the hard disk drive cloning process , 1 unit of full-size USB port is connected to an external DVD-RW drive (so that  we can insert a bootable Live  CD/DVD   like Clonezilla for cloning purposes) and the other 2 units of full-size USB port is connected to the SOURCE hard disk drive and the TARGET hard disk drive .  There are many solutions out there that can clone a hard disk drive without using a PC or a Laptop but if we can do with it a  15.6 inches  Chrome  Laptop/Tablet/Smartphone  hybrid
it would be great and it is definitely a bonus .  Perhaps  GOOGLE or the software developers could create apps or a System Utility that can clone hard disk drive with Chrome OS .