MBR2GPT failing with "Cannot find OS partition(s) for disk 0"

I'm trying to use MBR2GPT to convert an MBR/BIOS disk to GPT/UEFI. I'm getting the error Cannot find OS partition(s) for disk 0. I found this in setupact.log:

GetOSDeviceVolume: Cannot get NT path for entry.[gle=0x000000ea]
FindOSPartitions: Cannot get volume name for the recovery boot entry. Error: 0x000000EA[gle=0x000000ea]
Cannot find OS partition(s) for disk 0[gle=0x000000ea]

My OS is a recent Windows 10 version. It might be a Windows 7 upgrade, and the disk has been resized in the past with gparted. This is in a VM with a snapshot, so I can run risky commands and revert without any problems.

Command I'm running:

C:\WINDOWS\system32>MBR2GPT.EXE /convert /allowfullos
MBR2GPT will now attempt to convert the default book disk.
If conversion is successful the disk can only be booted in GPT mode.
These changes cannot be undone!
MBR2GPT: Attempting to convert disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Cannot find OS partition(s) for disk 0

Complete setupact.log:

2021-09-28 10:10:50, Info MBR2GPT was explicitly asked to run in full OS mode.
2021-09-28 10:10:50, Info MBR2GPT: System disk number is 0
2021-09-28 10:10:50, Info MBR2GPT: Attempting to convert disk 0
2021-09-28 10:10:50, Info MBR2GPT: Retrieving layout of disk
2021-09-28 10:10:50, Info MBR2GPT: Initial partition information
2021-09-28 10:10:50, Info ===========================================================
2021-09-28 10:10:50, Info Partition layout for disk: 0
2021-09-28 10:10:50, Info Partition style : MBR
2021-09-28 10:10:50, Info MBR signature: 53033256
2021-09-28 10:10:50, Info Number of partitions : 3
2021-09-28 10:10:50, Info ===================PARTITION===============================
2021-09-28 10:10:50, Info Number: 1
2021-09-28 10:10:50, Info Type: 7
2021-09-28 10:10:50, Info Boot: Yes
2021-09-28 10:10:50, Info Recognized: Yes
2021-09-28 10:10:50, Info Style: 0
2021-09-28 10:10:50, Info Offset: 1048576
2021-09-28 10:10:50, Info Length: 524288000
2021-09-28 10:10:50, Info Volume: \\?\Volume{03293928-0000-0000-0000-100000000000}\
2021-09-28 10:10:50, Info Drive: None
2021-09-28 10:10:50, Info NT Path: \Device\HardDisk0\Partition1
2021-09-28 10:10:50, Info ===================PARTITION===============================
2021-09-28 10:10:50, Info Number: 2
2021-09-28 10:10:50, Info Type: 7
2021-09-28 10:10:50, Info Boot: No
2021-09-28 10:10:50, Info Recognized: Yes
2021-09-28 10:10:50, Info Style: 0
2021-09-28 10:10:50, Info Offset: 525336576
2021-09-28 10:10:50, Info Length: 79455782912
2021-09-28 10:10:50, Info Volume: \\?\Volume{03293928-0000-0000-0000-501f00000000}\
2021-09-28 10:10:50, Info Drive: C:\
2021-09-28 10:10:50, Info NT Path: \Device\HardDisk0\Partition2
2021-09-28 10:10:50, Info ===================PARTITION===============================
2021-09-28 10:10:50, Info Number: 3
2021-09-28 10:10:50, Info Type: 39
2021-09-28 10:10:50, Info Boot: No
2021-09-28 10:10:50, Info Recognized: Yes
2021-09-28 10:10:50, Info Style: 0
2021-09-28 10:10:50, Info Offset: 79982622720
2021-09-28 10:10:50, Info Length: 542868480
2021-09-28 10:10:50, Info Volume: \\?\Volume{03293928-0000-0000-00f8-559f12000000}\
2021-09-28 10:10:50, Info Drive: None
2021-09-28 10:10:50, Info NT Path: \Device\HardDisk0\Partition3
2021-09-28 10:10:50, Info ===========================================================
2021-09-28 10:10:50, Info ESP partition size will be 104857600
2021-09-28 10:10:50, Info MBR2GPT: Validating layout, disk sector size is: 512 bytes
2021-09-28 10:10:50, Info BCD: Opening store. Flags: 0x0
2021-09-28 10:10:50, Info BCD: Store path: "\??\GLOBALROOT\device\harddisk0\partition1\Boot\BCD"
2021-09-28 10:10:50, Info BCD: Loaded hive at BCD00000000
2021-09-28 10:10:50, Info BCD: Opening object {9dea862c-5cdd-4e70-acc1-f32b344d4795}
2021-09-28 10:10:50, Info FindOSPartitions: Default boot entry: {001E9BBC-213D-11EB-B4BB-F2D0CE0F2B87}
2021-09-28 10:10:50, Info BCD: Opening object {001e9bbc-213d-11eb-b4bb-f2d0ce0f2b87}
2021-09-28 10:10:50, Info VERBOSE: Device path: \Device\HarddiskVolume2
2021-09-28 10:10:50, Info VERBOSE: Dos path: \\?\GLOBALROOT\Device\HarddiskVolume2
2021-09-28 10:10:50, Info FindOSPartitions: Volume name for the default boot entry: \\?\Volume{03293928-0000-0000-0000-501f00000000}\
2021-09-28 10:10:50, Info BCD: Opening object {1cac28c7-213d-11eb-8bd4-98ea449f7573}
2021-09-28 10:10:50, Error GetOSDeviceVolume: Cannot get NT path for entry.[gle=0x000000ea]
2021-09-28 10:10:50, Error FindOSPartitions: Cannot get volume name for the recovery boot entry. Error: 0x000000EA[gle=0x000000ea]
2021-09-28 10:10:50, Error Cannot find OS partition(s) for disk 0[gle=0x000000ea]
2021-09-28 10:10:50, Info MBR2GPT: Partition information at error point
2021-09-28 10:10:50, Info ===========================================================
2021-09-28 10:10:50, Info Partition layout for disk: 0
2021-09-28 10:10:50, Info Partition style : MBR
2021-09-28 10:10:50, Info MBR signature: 53033256
2021-09-28 10:10:50, Info Number of partitions : 3
2021-09-28 10:10:50, Info ===================PARTITION===============================
2021-09-28 10:10:50, Info Number: 1
2021-09-28 10:10:50, Info Type: 7
2021-09-28 10:10:50, Info Boot: Yes
2021-09-28 10:10:50, Info Recognized: Yes
2021-09-28 10:10:50, Info Style: 0
2021-09-28 10:10:50, Info Offset: 1048576
2021-09-28 10:10:50, Info Length: 524288000
2021-09-28 10:10:50, Info Volume: \\?\Volume{03293928-0000-0000-0000-100000000000}\
2021-09-28 10:10:50, Info Drive: None
2021-09-28 10:10:50, Info NT Path: \Device\HardDisk0\Partition1
2021-09-28 10:10:50, Info ===================PARTITION===============================
2021-09-28 10:10:50, Info Number: 2
2021-09-28 10:10:50, Info Type: 7
2021-09-28 10:10:50, Info Boot: No
2021-09-28 10:10:50, Info Recognized: Yes
2021-09-28 10:10:50, Info Style: 0
2021-09-28 10:10:50, Info Offset: 525336576
2021-09-28 10:10:50, Info Length: 79455782912
2021-09-28 10:10:50, Info Volume: \\?\Volume{03293928-0000-0000-0000-501f00000000}\
2021-09-28 10:10:50, Info Drive: C:\
2021-09-28 10:10:50, Info NT Path: \Device\HardDisk0\Partition2
2021-09-28 10:10:50, Info ===================PARTITION===============================
2021-09-28 10:10:50, Info Number: 3
2021-09-28 10:10:50, Info Type: 39
2021-09-28 10:10:50, Info Boot: No
2021-09-28 10:10:50, Info Recognized: Yes
2021-09-28 10:10:50, Info Style: 0
2021-09-28 10:10:50, Info Offset: 79982622720
2021-09-28 10:10:50, Info Length: 542868480
2021-09-28 10:10:50, Info Volume: \\?\Volume{03293928-0000-0000-00f8-559f12000000}\
2021-09-28 10:10:50, Info Drive: None
2021-09-28 10:10:50, Info NT Path: \Device\HardDisk0\Partition3
2021-09-28 10:10:50, Info ===========================================================

bcdedit:

C:\WINDOWS\system32>bcdedit
Windows Boot Manager
--------------------
identifier {bootmgr}
device partition=\Device\HarddiskVolume1
description Windows Boot Manager
locale en-US
inherit {globalsettings}
default {current}
resumeobject {001e9bbb-213d-11eb-b4bb-f2d0ce0f2b87}
displayorder {current}
toolsdisplayorder {memdiag}
timeout 30
Windows Boot Loader
-------------------
identifier {current}
device partition=C:
path \WINDOWS\system32\winload.exe
description Windows 10
locale en-US
inherit {bootloadersettings}
recoverysequence {1cac28c7-213d-11eb-8bd4-98ea449f7573}
displaymessageoverride Recovery
recoveryenabled Yes
allowedinmemorysettings 0x15000075
osdevice partition=C:
systemroot \WINDOWS
resumeobject {001e9bbb-213d-11eb-b4bb-f2d0ce0f2b87}
nx OptIn
bootmenupolicy Standard

3 Sorted by: Reset to default

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MBR2GPT failing with "Cannot find OS partition(s) for disk 0"

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