1.    08 May 2017 #1
    Join Date : May 2017
    Posts : 2
    Windows 10

    Windows 10 OS - GPT Primary Partition Set As EFI System Partition


    Greetings! This is my first problem post here on TenForums and it is a frustrating one. To make a long story short, I installed Windows 10 on my notebook, leaving a large amount of unallocated space available for a future Linux install. Windows 10 had been running without issue until I decided to get my Linux environment up and running.

    I followed a very well known guide to install a particular distro in dual-boot with Windows 10, but upon reboot I was not able to get into my Windows OS. After a number of attempts to fix, repair, etc., I decided to clean the disk of everything Linux related, which leaves me with my original four partitions:

    Part 1 - Recovery
    Part 2 - Reserved
    Part 3 - System (OS)
    Part 4 - System (EFI)

    After following another few guides to repair/fix EFI boot records and directories, I was still unable to boot into Windows OS. I will either get a "No Media Present" error or I will get an error that says that WinLoad.EFI cannot be found.

    After some more research I noticed in DISKPART that my Windows OS partition, which should be a Primary partition, has the TYPE attribute of an EFI System Partition. My conclusion is that at some point in the install or attempt to fix my Windows OS boot, the Windows OS system partition was told that it was an EFI System Partition, thus unable to boot as an OS.

    As it stands, I have two EFI System Partitions, one that should contain all the correct boot information and one that is actually my Windows OS and should be a primary partition.

    My question is this, could I simply use the SETID command in DISKPART to change the ID/Type of the partition to be something other than an EFI System Partition? Or is there another option here? My primary goal is to retrieve my data from my Windows OS partition. I am planning on cleaning the drive and starting from scratch after retrieving the data, so if there is a better approach, such as a live boot disk that will let me copy the data off, I would be willing to go that route.

    Thanks for your help and advice!
      My ComputerSystem Spec
  2.    08 May 2017 #2
    Join Date : Dec 2015
    Posts : 6,011
    Windows10
      My ComputerSystem Spec
  3.    08 May 2017 #3
    Join Date : May 2017
    Posts : 2
    Windows 10
    Thread Starter

    Thanks for the referral, I'll check it out and give it a shot. I'm currently in a secure environment and can't connect USB devices, so I'll have to try this out when I return home or find wireless.
      My ComputerSystem Spec
  4.    08 May 2017 #4
    Join Date : Jul 2015
    Posts : 9,419
    Windows 10 Pro

    Once you can get into a command prompt with administrator privileges its:

    diskpart
    list disk
    select disk # <- replace # with the disk number of the drive you need to change
    list part
    select part # <- replace # with the partition number of the Windows partition
    set id=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 override
    exit
    exit
      My ComputerSystem Spec

 


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