Recommended Size of EFI Partition V1709


  1. Caledon Ken
    Posts : 30,192
    Windows 11 Pro x64 Version 23H2
       New #1

    Recommended Size of EFI Partition V1709


    I recently built a machine and have noticed that my EFI partition size is 100MB. I clean installed with V1703 and subsequently upgrade to V1709

    Reading the threads (some in forum and some on web) there seems to be a lot of noise that the EFI partition should be 500+ MB.

    In this article it says the minimum is 100MB, dated May 2017.

    https://docs.microsoft.com/en-us/win...ive-partitions

    As the build is new I thought I would address any size issues now rather than later.

    Does anyone have a link to a MS technical document that states a recommended EFI size? (not the minimum size)

    Thanks
      My Computer
    Quote Quote

  3. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #2

    The size provided by Microsoft's script in this article is 100mb:
    UEFI/GPT-based hard drive partitions | Microsoft Docs

    I've had no issues with 100mb EFI system partitions.
      My Computer
    Quote Quote

  4. Caledon Ken
    Posts : 30,192
    Windows 11 Pro x64 Version 23H2
    Thread Starter
       New #3

    Thank you NavyLCDR.

    That is the same article I posted with minimum.

    Are you dual booting anything? Pretty sure you are are as I've seen posting where you have Macrium (I think) at end of your disk.
      My Computer
    Quote Quote

  6. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #4

    Yes, dual booting Windows 10 Pro and Education on my laptop. On my desktop at home I am booting Windows 10 Pro, Windows 7 Pro, and Windows 7 Home Premium. When you add a different OS to the boot menu which runs from the BCD, it only adds a few lines of text to the BCD and only consumes a few addition bytes - not even 1K more.

    According to MiniTool, my EFI System Partition has 29.4 MB used out of 101 MB and that is dual booting - with a third menu option to boot into Kyhi's Recovery Tools from a second installed hard drive.
      My Computer
    Quote Quote

  7. Caledon Ken
    Posts : 30,192
    Windows 11 Pro x64 Version 23H2
    Thread Starter
       New #5

    Thanks.

    Made by life a whole lot easier. Had a crazy plan developed to resize and moving 16MB MSR was a real issue.

    Thanks again.
      My Computer
    Quote Quote

  8. zbook
    Posts : 41,474
    windows 10 professional version 1607 build 14393.969 64 bit
       New #6

    The default size of the EFI partition is now 100 MB.

    The size of the EFI partition was chosen by Microsoft as a size that should be able to allow sufficient space for:
    languages
    fonts
    BIOS firmware
    BIOS updates
    computer manufacturer firmware/software

    There are firmware/software that are installed into the the EFI partition instead of the data drive.
    Over time the free space within the EFI partition decreases with BIOS updates.
    When it comes time to Windows upgrades it will need a certain amount of free space within the EFI partition.

    On a custom computer there should not be any problems with a Windows upgrade related to the size of the EFI or MSR partition.

    Windows upgrade failures related to EFI or MSR partition free space are more common in non-custom computers that have had multiple bios upgrades or software/firmware installed in the EFI partition.
      My Computer
    Quote Quote

  9. Caledon Ken
    Posts : 30,192
    Windows 11 Pro x64 Version 23H2
    Thread Starter
       New #7

    Thanks zbook. Solid technical information.
      My Computer
    Quote Quote

 

  Related Discussions
Hi, I'm running short of space on my Windows 10 64 bit PC. I carried out a clean install of windows 10 approx 2 months ago. I have a 256 SSD with 16 GB Ram and the page size is set at 25466 MB. Is this too big. I also run Disk clean-up and then...
Whats the recommended size for Restore Points for an Win10 system partition when I want to store e.g. 8 restore points? Where can I defined where (in which partition) these restore points should be stored? Or are they always on the same partition...
Hi folks with latest versions of Windows - if you try and re-size the windows partition from Within windows the system fails -- you used to be able to start the resize then windows would boot into the relevant partition manager in command mode and...
Increase partition size
in Drivers and Hardware

Had 8.1 then downloaded 10, unfortunately when I originally installed 8.1 I made my C partition too small and it's almost full all the time. Is there anyway to increase the size? Also I want to reset my PC right now since it's gotten extremely...
Just wondering what's the minimum and recommended size for system restore to work well? Thanks!
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

 © Designer Media Ltd
All times are GMT -5. The time now is 11:57.
Find Us




Windows 10 Forums