Can I Boot A Macrium Rescue USB Drive On A UEFI Boot Only System

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  1. Posts : 15,441
    Windows10
       #11

    Anibor said:
    In my experience, a UEFI computer will boot from a UFD as long as it has a FAT32 partition, and the necessary boot files are in this partition. The fact that the installed OS is Windows 10 or 11 is completely irrelevant. So is the boot mode, UEFI or legacy. Also, the UFD can have one or two partitions, and the FAT32 partition can be the first or the second.

    And to create the UFD, I simply format it with FAT32, mount the ISO and copy its contents to the UFD. If the UFD is already formatted with FAT32, it´s not necessary to reformat it, just to delete the existing files and copy the new from the mounted ISO.

    All the rest and unnecessary complications.
    Yep - only slight complication is when install.wim is over 4 GB but that can be handled easy enough. This is not an issue for Reflecr isos as much smaller.
    Last edited by cereberus; 11 Jan 2022 at 22:39.
      My Computer


  2. Posts : 9
    Windows 10
    Thread Starter
       #12

    Thanks for all of the suggestions and information. Here's what I found out. I took a brand new factory sealed Samsung 32GB drive formatted in MBR mode and mounted it. This time, Macrium gave me an option of selecting "Enabling multi-boot - (MBR/UEFI) - Recommended for your system". I went ahead and built the WinPe system on it, plugged it in and it booted right up and ran. It was as simple as that.

    I didn't try it with the ISO in FAT32 partition on a GPT drive since I figured that I already had a solution.

    Previously, when I had just tried inserting GPT drives Macrium just gave me a terse message saying "GPT Format Not Supported" with no more information than just that. What Macrium probably should do is add another short message after that blunt first message about GPT drives saying something to the effect that "using an MBR drive will give you a multi-boot MBR/UEFI" option" which it only provides now when you insert a MBR drive. That would help clear up any confusion for people like me who probably tend to over think things!

    I just figure anytime I need to use a rescue disk is probably going to be a tense time and I want things as simple as possible at that moment.

    Running Win 10 Ver 20H2, Dell Inspiron 3891 I5-10400, 4.3 Ghz, RAM 16GB, Samsung M.2 SSD 970 EVO Plus
      My Computer


 

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