Windows 10: Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 30,021
    64-bit Windows 10 Pro build 17692
    Thread Starter
       1 Week Ago #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.    1 Week Ago #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.
      My ComputerSystem Spec


  3. Posts : 30,021
    64-bit Windows 10 Pro build 17692
    Thread Starter
       1 Week Ago #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.    23 Minutes Ago #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. Posts : 30,021
    64-bit Windows 10 Pro build 17692
    Thread Starter
       16 Minutes Ago #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.    10 Minutes Ago #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:	0 
Size:	47.0 KB 
ID:	193011
    I think I got it showing there correctly
      My ComputerSystem Spec


 
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