Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Brink's Avatar
    Posts : 33,851
    64-bit Windows 10 Pro build 18282
    Thread Starter
       12 Jun 2018 #100

    Something is failing the check for disk 0.

    Please go ahead and post a screenshot of Disk Management showing your full layout to see if it will reveal what's wrong with disk 0.

    Disk Management - How to Post a Screenshot of | Windows 10 Tutorials
      My ComputersSystem Spec

  2.    12 Jun 2018 #101

    slamdunk said: View Post
    Thanks.
    I get this

    Code:
    C:\WINDOWS\system32>mbr2gpt /validate
    ERROR: MBR2GPT can only be used from the Windows Preinstallation Environment. Use /allowFullOS to override.
    
    C:\WINDOWS\system32>mbr2gpt /validate /allowFullOS
    MBR2GPT: Attempting to validate disk 0
    MBR2GPT: Retrieving layout of disk
    MBR2GPT: Validating layout, disk sector size is: 512 bytes
    Disk layout validation failed for disk 0
    EDIT: Never mind. I had 4 partitions then I deleted an unused one now it works.
    Yeah - mbr2gpt is a bit stupid if you have four primary partitions with one being the mbr sytem partition. It tries to create an efi partition, and falls over as you can only have four primary partitions in legacy mbr bios.

    It makes more sense to do as you did in effect i.e. delete system partition first.
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  3. Brink's Avatar
    Posts : 33,851
    64-bit Windows 10 Pro build 18282
    Thread Starter
       12 Jun 2018 #102

    slamdunk said: View Post
    EDIT: Never mind. I had 4 partitions then I deleted an unused one now it works.
      My ComputersSystem Spec

  4.    20 Jun 2018 #103

    Brink said: View Post
    Hoping you may be able to assist me as well.
    This is driving me bonkers trying ot figure this thing out. I keep getting the following failure:
    C:\WINDOWS\system32>mbr2gpt /validate /disk:0 /allowFullOS
    MBR2GPT: Attempting to validate disk 0
    MBR2GPT: Retrieving layout of disk
    MBR2GPT: Validating layout, disk sector size is: 512 bytes
    Disk layout validation failed for disk 0

    But when I check partitions, I only have the following:
    DISKPART> list partition

    Partition ### Type Size Offset
    ------------- ---------------- ------- -------
    Partition 1 Primary 446 GB 1024 KB
    Partition 2 Recovery 468 MB 446 GB

    So it isn't due to too many partitions on drive 0, it's an M.2 drive and it isn't in need of defrag or chkdsk'ing.
    When I look at Disk Management, Disk 0 shows my C: drive and the 468 MB Recovery Partition, just like the diskpart partition shows...
    Any idea what's causing my issue?
      My ComputerSystem Spec

  5. Brink's Avatar
    Posts : 33,851
    64-bit Windows 10 Pro build 18282
    Thread Starter
       20 Jun 2018 #104

    Hello deadlyvortex, and welcome to Ten Forums.

    Please go ahead and post a screenshot of Disk Management showing your full layout to see if it may reveal what's wrong with disk 0.

    Disk Management - How to Post a Screenshot of | Windows 10 Tutorials
      My ComputersSystem Spec

  6.    20 Jun 2018 #105

    Brink said: View Post
    Hello deadlyvortex, and welcome to Ten Forums.

    Please go ahead and post a screenshot of Disk Management showing your full layout to see if it may reveal what's wrong with disk 0.

    Disk Management - How to Post a Screenshot of | Windows 10 Tutorials
    Click image for larger version. 

Name:	Capture.PNG 
Views:	39 
Size:	47.0 KB 
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    I think I got it showing there correctly
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  7. Brink's Avatar
    Posts : 33,851
    64-bit Windows 10 Pro build 18282
    Thread Starter
       20 Jun 2018 #106

    I noticed that your "Active" partition is on Disk 1 instead of Disk 0.

    As a test, disconnect Disk 1, 2, and 3 leaving only Disk 0 connected to see if you're still able to boot into Windows 10 and convert to UEFI.

    If you can't boot, then you could see if running a Startup Repair may allow you to afterwards.

    Run Startup Repair in Windows 10 | Windows 10 Tutorials
      My ComputersSystem Spec

  8.    20 Jun 2018 #107

    Brink said: View Post
    I noticed that your "Active" partition is on Disk 1 instead of Disk 0.

    As a test, disconnect Disk 1, 2, and 3 leaving only Disk 0 connected to see if you're still able to boot into Windows 10 and convert to UEFI.

    If you can't boot, then you could see if running a Startup Repair may allow you to afterwards.

    Run Startup Repair in Windows 10 | Windows 10 Tutorials
    Should I simply right click on the C: drive area and select to mark it as Active rather than all of that?
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  9. Brink's Avatar
    Posts : 33,851
    64-bit Windows 10 Pro build 18282
    Thread Starter
       20 Jun 2018 #108

    Yes, you could try that as well, but you should still disconnect the other drives to prevent any possible issues with something being written to them during the conversion.
      My ComputersSystem Spec

  10.    20 Jun 2018 #109

    Brink said: View Post
    Yes, you could try that as well, but you should still disconnect the other drives to prevent any possible issues with something being written to them during the conversion.
    So I tried unplugging the other drives, but it then acted like I didn't have a boot drive available. Does that indicate that the other disk is the boot drive rather than my m.2 Disk 0 drive? That doesn't make any sense if so....
      My ComputerSystem Spec


 
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