Windows 10: Lost EFI/ESP Partition | No Room Preceding OS Part | Options?

Discus and support Lost EFI/ESP Partition | No Room Preceding OS Part | Options? in Windows 10 Installation and Upgrade to solve the problem; Lost EFI/ESP Partition. After deleting MSR, on 17Mb is available (tutorial on woshub to re-add ESP + MSR, then copy *.efi files from %windir%) Diskpart... Discussion in 'Windows 10 Installation and Upgrade' started by hAirypAulsAck, Mar 22, 2019.

  1. Lost EFI/ESP Partition | No Room Preceding OS Part | Options?


    • Lost EFI/ESP Partition.
    • After deleting MSR, on 17Mb is available (tutorial on woshub to re-add ESP + MSR, then copy *.efi files from %windir%)
    • Diskpart shrink QUERYMAX tells me that I have 4gb, but wont let me free up (tried 228 [100efi + 128msr as well trying 116 after finding out win10 msr only 16mb).




    • Can I migrate / defreg files to back of disk, opening up more room b4 os part?
    • what about single partition windows installs, where x looks in windir for boot information? where x is ? EFI? BCD? i'm not sure, i got the impression that if no ESP part, windows looks in the %windir%




    thanks =)

    :)
     
    hAirypAulsAck, Mar 22, 2019
    #1
  2. budi Win User

    How do I move ESP - EFI SYstem Partition - from a partition to another


    ESP was created but
    bcdboot C:\windows /s U: (or with /f UEFI)
    not works, info is still Hidden in DIskpart list vol or None in 3rd party GUI partition programs


    Lost EFI/ESP Partition | No Room Preceding OS Part | Options? [​IMG]


    start and login normally, no multi boot option
     
  3. topgundcp Win User
    How do I move ESP - EFI SYstem Partition - from a partition to another


    You must have done something wrong or did not follow exactly what I posted above. If done correctly, you should see 2 EFI System partitions and both can boot into Windows. From Boot Menu, you should see 2 Windows Boot Manager


    Lost EFI/ESP Partition | No Room Preceding OS Part | Options? [​IMG]


    Why did you use list volume instead of list partition ? you need to know which partition to delete.


    Lost EFI/ESP Partition | No Room Preceding OS Part | Options? [​IMG]


    Lost EFI/ESP Partition | No Room Preceding OS Part | Options? [​IMG]


    Try again. Use the first Windows Boot Manager to boot. Once in Windows, delete the second Windows Boot Manager.
     
    topgundcp, Mar 22, 2019
    #3
  4. gronostaj Win User

    Lost EFI/ESP Partition | No Room Preceding OS Part | Options?

    Create EFI partition before installing Windows 10

    Most likely, you won't need larger ESP (EFI System Partition). Windows OS loader is rather small and Fedora will most likely just install GRUB on ESP and place the rest of its boot files in /boot which will be on a separate partition anyway. Unless you're going to experiment with unusual Linux setups (like EFISTUB booting etc.), 100 MB should be sufficient.

    If you want to have a larger ESP just in case, you can create one using Windows installation media before the partitioning step.

    How to manually create ESP using Windows installation media

    Before the partitioning step:

    (Technically, you could also do this on the partitioning step and click Refresh afterwards.)

    1. Press Shift+F10 to open Command Line.
    2. Type diskpart Enter. Diskpart will take a while to launch.
    3. Type list disk Enter A list of disks will be printed. Note the number next to yours (most likely 0). Select that disk: select disk 0 Enter.
    4. Create ESP: create partition efi size=500 Enter (500 is partition size in MiB).
    5. Exit Diskpart: exit Enter.
     
    gronostaj, Mar 22, 2019
    #4
Thema:

Lost EFI/ESP Partition | No Room Preceding OS Part | Options?

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