I want to create a personal portable Elementary OS install on a 64GB USB stick.
My personal PC is UEFI with GPT, dual boot Arch Linux and Windows 10. I want to be able to boot the USB to recover my UEFI computer in the future and use the same USB on a school BIOS MBR computer.
I have a separate 4GB USB I can use to install the OS to the 128GB USB from my UEFI computer.
Once I get the Elementary OS iso on the 4GB USB, how do I proceed to install it to the 128GB USB?
(Please try to keep it simple, I'm bad at partitioning)
Edit 1: Also, I'm not willing to disconnect the hard drive for the process if possible, is this dangerous? I have a UEFI grub dual boot on the hard drive of the PC I'm doing the installation from.
Edit 2: From watching an Elementary OS installation video, I figured out you can create a new
/boot/efi for the USB so I don't need to disconnect my hard drive. This does not solve the BIOS problem, as I still don't know how to make the USB bootable on Legacy BIOS too.