How to install Win10 when the Recovery & EFI partitions were deleted?

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  1. Posts : 133
    Windows 10 & Ubuntu Studio
       #1

    How to install Win10 when the Recovery & EFI partitions were deleted?


    I made the mistake of deleting the Recovery & EFI partitions (long stupid story).
    Now I cannot load windows to do a Reset, nor even just install from a live USB drive.
    This is an Acer desktop (Predator G3 710), about 4 years old.
    Would it help to boot from a live Linux USB to delete all partitions? Would the Windows 10 installer create the partitions it needs, or should I create them myself?
    I found this tutorial "Windows 10 clean install on a formatted (blank) hard drive". I just wished it wasn't as long

    Thanks guys!

    DPC
      My Computer


  2. Posts : 43,010
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #2

    Hi, how did you delete the partitions?

    a. One possible option, depending on what you did, is to recover the partitions by booting your PC from the bootable disk of a 3rd party partition manager that supports partition recovery, or from a live boot disk that includes one.

    b. Do you wish to recover your installed Windows, or do you really wish to clean install anyway?
    If you were to do so you would wish to recover any data not backed up. You could do that by booting from a live boot disk, for example.

    c. Disk imaging: From what you're saying you haven't been using disk imaging routinely (e.g. Macrium Reflect - free + lare enough external storage for image files).

    So very often tirelessly recommended here to give you a second chance when things go badly wrong. Had you been doing so you could have recovered using that.

    d. Missing EFI partitions can be rebuilt. There are example cases in threads on tenforums.

    e. A clean install is relatively routine. The tutorial shows all that happens- you just respond to the prompts, more or less.
    Key point: you delete (about step 13/14) all existing partitions comprising the O/S and install to unallocated space.

    f. Finally another option would be to image your existing C: or copy it off to another disk, clean install Win 10 then restore the old Windows partition in place of the newly created one.

    Which way do you want to go?
      My Computers


  3. Posts : 16,953
    Windows 10 Home x64 Version 22H2 Build 19045.4170
       #3

    DPC,

    Nothing should be stopping you running a clean install.
    Clean Install - TenForumsTutorials
    - This involves booting from an InstallUSB.
    - It will create all the partitions it wants.

    What makes you think you cannot do this?
    - Were you possibly trying to run the InstallUSB's setup.exe without booting from it? That would be a 'Repair install' [aka 'InPlace upgrade'] and cannot be done unless Windows boots normally - despite its name, this would be a repair procedure not an installation procedure.

    If you need to rescue your documents etc files beforehand then say so and guidance can be given. Rescuing files also makes use of the InstallUSB or any similar bootable drive.

    Denis
      My Computer


  4. Posts : 6,345
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #4

    How did you deleted the partitions? Disk manager? Diskpart?

    If you have any other drives, detach them from the MB (SATA or power cable) for safety reasons.

    Win 10 on a GPT drive has 4 partitions
    - UEFI - Fat32 - 100M
    - Other - 16M
    - Windows - NTFS
    - Recovery - NTFS - ~600M

    If you haven't deleted the Windows partition you have two options:
    - Boot from the Win 10 installation drive as UEFI (not Legacy) and install Windows on the same partition that you have Windows.
    It will rebuild the UEFI, other and Recovery partitions and all your files and folders will be moved to a Windows.old folder. Then you can boot from a USB drive (like the Linux live) and delete all files and folders BUT not Windows.old folder. Then move all files and folders inside Windows.old folder to the root of the partition. Done - Recommended

    - Boot from a Win 10 installation drive as UEFI, and launch a CMD window (Shift+f10). Using Diskpart create the fat32 partition and then rebuild the boot loader on it.

    diskpart
    list disk
    select disk 0 (make sure is the right drive)
    list part (see if you have one unallocated partition before the Windows partition)
    list volume (see the letter of the Windows partition. It may not be C:)
    select part 1
    delete part override
    create part EFI
    format fs=fat32 quick
    assign letter=w
    exit
    bcdboot C:\Windows /s W: /f UEFI (make sure C: is the windows partition)
    exit
    Last edited by Megahertz; 17 Jan 2021 at 16:03.
      My Computers


  5. Posts : 18,432
    Windows 11 Pro
       #5

    Megahertz said:
    - Boot from a Win 10 installation drive as UEFI, and launch a CMD window (Shift+f10). Using Diskpart create the fat32 partition and then rebuild the boot loader on it.

    diskpart
    list disk
    select disk 0 (make sure is the right drive)
    list part (see if you have one unallocated partition before the Windows partition)
    list volume (see the letter of the Windows partition. It may not be C:)
    select part 1
    delete part override
    create part EFI
    format fs=fat32 quick
    assign letter=w
    exit
    bcdboot C:\Windows /s W: /f UEFI (make sure C: is the windows partition)
    exit
    There are a couple of issues with the above sequence. First, @drpeppercan stated that they already deleted the EFI system and recovery partition. So why is there a select part 1 and delete part override in the command sequence? What is being deleted? The Microsoft System Reserved partition? Hopefully there is an MSR partition there because if partition 1 is the Windows OS partition, then you just deleted Windows. And if there is an MSR partition there, why delete it?

    Second, without a size specified when creating the EFI System Partition, it is just going to fill all available free space at the beginning of the drive. If there was a recovery partition, EFI System Partition and MSR partition, that free space is likely to be 600 MB is size, so you just created a 600 MB EFI System Partition that only needs to be 100 MB in size.

    Without seeing the layout of the disk with: select disk 0, detail disk, list part you can't really suggest an accurate list of commands to rebuild the EFI system partition. It's only guessing.
      My Computer


  6. Posts : 6,345
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #6

    I really don't know what he did and what he has.

    My intention was to avoid a clean install as others suggested.
    That is why I recommended the first option.

    You're right, second option has errors.
    On second option I asked to "list part (see if you have one unallocated partition before the Windows partition)"

    As you're top guru, could you please give us the correct CMDs?
      My Computers


  7. Posts : 133
    Windows 10 & Ubuntu Studio
    Thread Starter
       #7

    Sorry I didn't provide enough information guys.
    Yes, I did use DiskPart.
    What messed it up for me was the fact that the Disk Management app showed the drives in an upside down order on the lower window. In the upper window they followed a logical sequence (C:, D:, E:). But in the lower window they were inverted, and I had not noticed. I assumed that the order sequence in the lower window was the same. My mistake, I should have never assumed.
    So while I thought I was deleting partitions from disk 2, they really were from Disk 1 with Windows 10! Talk about learning the hard way!
    Anyway.
    I created the Windows Installation Media with the Media Creation Tool. At first it did not want to install it, I should've taken a photo of the message. But that was resolved with a boot. It worked on the second attempt.
    So now Windows is installed.
    Now the problem I have is that it's asking me to use a Windows account when I need to sell this computer. What will it happen if I turn it off now? Will it be back right at that step when turned on again? (I would think so).
    I also needed to confirm that Windows is imbedded in the MoBo so no activation will be needed (because it's an Acer computer). But I don't know 100%.

    Thanks for all the valuable information you guys sent me. I feel bad that I didn't get to use much of it

    DPC
      My Computer


  8. Posts : 6,345
    Windows 11 Pro - Windows 7 HP - Lubuntu
       #8

    Did you do a clean install deleting all partitions?

    If you're going to sell the computer you have to wipe the empty space or some data can be recovered.

    You should have used diskpart clean all on the drive before installing Win 10 without internet connection.
    When you reach the point to enter a user name, shut down and sell the computer.
      My Computers


  9. Posts : 18,432
    Windows 11 Pro
       #9

    Megahertz said:
    As you're top guru, could you please give us the correct CMDs?
    I can not (nor can anyone, really) give the correct commands because we don't know what is currently on the disk in question.

    @drpeppercan,

    To get into the new install of Winodws 10 without creating a real account nor logging in, at the first screen of the OOBE (after Windows installs), press Shift+ Ctrl + F3. Some keyboards require Shift + Ctrl+ Fn + F3 (all at the same time). This will reboot the computer into Audit mode and you can do whatever you want. Check activation, updates, drivers, etc. When you are done and ready to sell it, select the option to start in OOBE mode, and shutdown in the little OOBE window that pops up.
      My Computer


  10. Posts : 133
    Windows 10 & Ubuntu Studio
    Thread Starter
       #10

    NavyLCDR said:
    I can not (nor can anyone, really) give the correct commands because we don't know what is currently on the disk in question.
    @drpeppercan,

    To get into the new install of Winodws 10 without creating a real account nor logging in, at the first screen of the OOBE (after Windows installs), press Shift+ Ctrl + F3. Some keyboards require Shift + Ctrl+ Fn + F3 (all at the same time). This will reboot the computer into Audit mode and you can do whatever you want. Check activation, updates, drivers, etc. When you are done and ready to sell it, select the option to start in OOBE mode, and shutdown in the little OOBE window that pops up.
    Oh wow! This is gold!
    Thanks a bunch for sharing NavyLCDR :)

    DPC
      My Computer


 

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