GPT Partition Style Problem for Clean Install of Windows 10

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  1. Posts : 23
    Windows 10
       #1

    GPT Partition Style Problem for Clean Install of Windows 10


    Having upgrade Windows 8.1 to W10, I wish to now do a clean install, but cannot install over current installation due to
    it being a GPT Partition style boot. I have heard this can be deleted and replaced with MBR but then will I have to format the partition?
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  2. bobkn's Avatar
    Posts : 4,056
    Win 11 X64 Pro 21H2 22000.100
       #2

    You'll want to keep GPT if you have a UEFI system, I think.

    I did a clean install by booting from a USB flash drive. I used the Win 10 installer to delete all the partitions on my boot drive (SSD). It then proceeded to create and format new partitions (4 of them, one not visible in Disk Management).

    In case you don't know: when asked for a key, press the small "skip" button. No key is needed. If you've installed and activated 10, it will activate for a clean install on the same hardware.
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  3. Slartybart's Avatar
    Posts : 3,502
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       #3

    RogHil43 said:
    Having upgrade Windows 8.1 to W10, I wish to now do a clean install, but cannot install over current installation due to
    it being a GPT Partition style boot. I have heard this can be deleted and replaced with MBR but then will I have to format the partition?
    A Clean install is just that - your data and programs will not exist after the process.
    Make sure you have backups of any data you want to keep, and you have the discs and keys for any purchased software.

    See: How to Clean Install Windows 10 (TenForums.com)
    Read through the instructions, especially the color boxes
    Ask questions about a step if you have any

    Step 7 Blue Note box: If you have the free Windows 10 offer, then you will need to click/tap on Skip since you will not have a product key.

    Step 11 is a branch to step 12 (no UEFI) OR step 13 (UEFI)

    You do NOT have to create the partitions manually.
    Windows install will create the partitions if the drive is unallocated as shown in the tutorial.

    Disconnect all other drives before the Clean install - then Windows can only write to that drive
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  4. Posts : 23
    Windows 10
    Thread Starter
       #4

    I have cleaned installed many times over the years, but for the first time, I have come across a GPT partition to deal with which is where the Windows 10 upgrade is located.It selects a different partition, which is the old Windows 8.1 Recovery partition. That's fine, I don't want this any more, and don't have a problem installing on it, but I do have a partition I created which is for all my data, and hope that it this is left intact. I also have to remove the old Windows 10 installation of C: drive.
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  5. Slartybart's Avatar
    Posts : 3,502
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       #5

    Ok, good to know that you've done this before.

    Please post a screen shot of Disk Management, so members can be specific on how to get the best results.
    See: How to Post a Screenshot of Disk Management
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  6. Posts : 107
    Windows 10
       #6

    Here is info about UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style). -> link



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  7. Kyhi's Avatar
    Posts : 3,710
    Windows 3.1 to Windows 10
       #7

    RogHil43 said:
    Having upgrade Windows 8.1 to W10, I wish to now do a clean install, but cannot install over current installation due to
    it being a GPT Partition style boot. I have heard this can be deleted and replaced with MBR but then will I have to format the partition?
    Since your system is already setup for UEFI_GPT -
    the issue is your setup media is booting the PC in MBR_Bios mode..

    You can disable legacy Boot option in Bios setting
    or you can rename BOOTMGR to BOOTMGR.old on your setup media
    either one of the above options will prevent your setup media from booting in Legacy (Bios-mbr mode)
    and force the pc to boot UEFI
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  8. Slartybart's Avatar
    Posts : 3,502
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       #8

    Windows install will figure out the BIOS/UEFI, disk schema if you let it. If you burn the install media to a DVD, you don't have to think about any of those things, you just have to back up you personal data, find the keys and discs for 3rd party purchased software and install Win10 to an unallocated/unformatted drive.

    The upgrade is even easier - just upgrade.
    Last edited by Slartybart; 17 Aug 2015 at 19:14. Reason: removed Genet quote - this member is not the Thread Starter and I misread the post - oops
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  9. topgundcp's Avatar
    Posts : 2,782
    Linux Mint 20.1 Win10Prox64
       #9

    Those are VMware virtual machines.
    Not really understand what you mean by this ?. The screenshots show the real partitioning scheme for real fresh install of Windows 10 for both MBR & UEFI.
      My Computer

  10. Slartybart's Avatar
    Posts : 3,502
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       #10

    topgundcp said:
    Not really understand what you mean by this ?. The screenshots show the real partitioning scheme for real fresh install of Windows 10 for both MBR & UEFI.
    This was my clue
    GPT Partition Style Problem for Clean Install of Windows 10-xxxxxx.png
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