This system (like every other new system) has no legacy mode. If you want to run Linux, the distribution you choose must be UEFI-compliant -- you don't have the option to boot from a distribution requiring legacy mode. [URL] If you're looking for better UEFI support, Ubuntu is the front-runner when it comes to that.  
Ok so I have a live full linux(manjaro - uses BIOS mbr proto.) on an sd card. This is perfectly bootable on my desktop running manjaro however does not even show up as a bootable drive on my windows laptop. I assume I need to enable legacy mode in the bios, however I cant find the option anywhere. I should also mention I am not running secure boot, my laptop is a dell inspiron 5405 and furthermore the sd card I have mentioned is being plugged in with a usb 2.0 adaptor rather than the native port.  One other question about allowing legacy mode: Will this still allow normal uefi boot off of the main ssd. thanks for your time
Trying to have windows on system ssd but still be able to boot into live linux 
sd card