EFI System Partition too small for Bitlocker


  1. Posts : 5
    Win10
       #1

    EFI System Partition too small for Bitlocker


    Hi.

    I'm just picking up a comment by @NavyLCDR here - Windows 10 System Partition Requirement UEFI - NTFS or FAT32 - Windows 10 Forums

    NavyLCDR said:
    You need to expand your FAT32 EFI System Partition to at least 350mb in size. I would recommend using MiniTool Partition Wizard to do it:
    Best Free Partition Manager for Windows | MiniTool Partition Free

    If you have the standard UEFI layout, you will have to take the space from the front of your C: drive partition (250 MB). There will be a small MSR partition that does not show up in disk management, you will have to move that over to the right, up against the new starting location of the C: drive partition. Then expand the EFI System Partition. Make sure to click the apply button. MiniTool will restart the computer to shrink the C: drive partition. The operation occurring when the computer reboots will look scary, but don't worry about it, it will do what it is supposed to do.

    I have this exact issue where by my EFI System partition is 260mb and I need it to be 350mb for Bitlocker to work and I have a 16mb Partition (Assume it's MBR) in between the EFI and C:\windows partition where I will need to take some of the space from.


    EFI System Partition too small for Bitlocker-capture.jpg

    Can someone or @NavyLCDR expand on this with maybe some more instructions please? I am using MinitTool but can use any other tool

    Many thanks
      My Computer


  2. Posts : 8,103
    windows 10
       #2

    The 16 met isnt mbr as your disk is gpt. It should be simple as you have over 500 meg unallocated so move c to the right into the free space and move all others to right then expand as needed
      My Computer


  3. Posts : 5
    Win10
    Thread Starter
       #3

    Thanks @Samuria.
    Should I delete the 16mb then?

    And how do I move the C drive into the 500meg of unallocated space? (I assume this will then give me 500meg before the C drive instead of afterwards?)


    Again, thank you
      My Computer


  4. Posts : 5
    Win10
    Thread Starter
       #4

    Hi. I've worked out how to free up space at the front of the C: \ Windows partition

    I just need to know what I need to do with the 16mb partition please?
      My Computer


  5. Posts : 15,480
    Windows10
       #5

    cmac10 said:
    Hi. I've worked out how to free up space at the front of the C: \ Windows partition

    I just need to know what I need to do with the 16mb partition please?
    Well, here is the thing. Nobody really knows. Nobody gets and adverse effect deleting it. It is allegedly reserved for future use but no indication from MS as to what.

    It is quite easy to recreate it if you ever need it.

    You can back it up using Macrium Reflect and restore it in future if yiu ever need it as well.

    I just delete it and have never had any issues.
      My Computer


  6. Posts : 5
    Win10
    Thread Starter
       #6

    Thanks for this @cereberus

    I have searched to see how to recreate it but i'm struggling, could you point me to some instructions please?

    I will try backing up using Macrium as you suggest, hoping the free one will do the job.

    Thanks again
      My Computer


  7. Posts : 15,480
    Windows10
       #7

    cmac10 said:
    Thanks for this @cereberus

    I have searched to see how to recreate it but i'm struggling, could you point me to some instructions please?

    I will try backing up using Macrium as you suggest, hoping the free one will do the job.

    Thanks again
    The free one is fine.

    To create an MSR partition, you use following diskpart command

    create partition msr size=16
      My Computer


  8. Posts : 5
    Win10
    Thread Starter
       #8

    The diskpart command works a treat. I don't think there's a need to back it up if you can create it that easily.

    I've made mine 130mb, just so that it fills the whole of the empty space.

    EFI System Partition too small for Bitlocker-capture.jpg

    Thanks again
      My Computer


 

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