It is an insecure and unreliable partition map that is prone to corruption and has severe limitation. In my opinion, MBR should just die and be forgotten, forever.

It won't let you choose whether you want MBR or GPT, it won't let you select GPT/UEFI only, and as cereberus described, it tries to create MBR to make it 'universal', however in reality, with modern systems, this is unneccesary and actually just makes things worse. That thing often fails, especially if you feed it a GPT disk. However, its boot-disk creator tool is mediocre to say at best. (Only Acronis True Image holds that same reputation to me) It is one of the most reliable tools, it has never failed on me. Running Win 10 Ver 20H2, Dell Inspiron 3891 I5-10400, 4.3 Ghz, RAM 16GB, Samsung M.2 SSD 970 EVO PlusHi! The usb drive is mbr to make it universal. Running Win 10 Ver 20H2, Dell Inspiron 3891 I5-10400, 4.3 Ghz, RAM 16GB, Samsung M.2 SSD 970 EVO PlusThe Macrium Rescue drive will boot on uefi or mbr. Running Win 10 Ver 20H2, Dell Inspiron 3891 I5-10400, 4.3 Ghz, RAM 16GB, Samsung M.2 SSD 970 EVO Plus My question is will I have any problems booting an MBR formatted rescue drive on a system which supports UEFI only booting? My Easeus ToDo has a GPT formatted rescue USB which I created and it boots up fine on my system. This is normal, and it is working as expected.<< > Note: Some newer computers will only support 'UEFI.' It will not include an option for Legacy at all even with the latest BIOS version installed. Mine falls in the category described in the note below. It is also brand new and at the latest level of Dell BIOS as well. It has no legacy booting capability at all. On the other hand, I have a newer Dell computer which supports 'UEFI' booting only. This doesn't seem like very advanced thinking to me but I guess it is what it is. It will only permit MBR formatted rescue drives. Apparently, Macrium won't support GPT formatted drives. The first problem I ran into after starting it was in trying to create a rescue USB. I am currently using Easeus ToDo and because of the number of recommendations I have gotten for Macrium Reflect Free, I decided to give it a try.

Macrium reflect free ufei