I already installed Zorin 15.3 core in my portable SSD (via USB 3 port) which is formatted by MBR partition system. Yes of course I must boot it from legacy boot since my computer is old and its not support UEFI.
But recently, I will use other computer which doesn't have legacy boot (just UEFI).
The question are :
- how to change MBR to GPT format without formatted my SSD since I know UEFI wont work on MBR
- After I success do first step, how to get boot from UEFI since I don't have EFI boot partition