Indeed !
This part you already know, I think but
Know your hardware -Samsung #Your first boot into TWRP
It is quite possible that you have a USB3 problem, so maybe you are just using the wrong machine 
Indeed !
This part you already know, I think but
Know your hardware -Samsung #Your first boot into TWRP
It is quite possible that you have a USB3 problem, so maybe you are just using the wrong machine