HRESULT 0xC03A000D (ERROR_VHD_PARENT_VHD_NOT

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Description:

The chain of virtual hard disks is broken. The system cannot locate the parent virtual hard disk for the differencing disk.

Could be also:
Constant	Type	OS
STATUS_VHD_PARENT_VHD_NOT_FOUND	NTSTATUS	Windows

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ERROR_VHD_BITMAP_MISMATCH	ERROR_VHD_CHILD_PARENT_ID_MISMATCH

ERROR_VHD_PARENT_VHD_NOT_FOUND

ERROR_VHD_PARENT_VHD_NOT_FOUND means a differencing VHD/VHDX cannot locate the parent disk it depends on. A child disk contains only changed blocks and is not a complete standalone disk.

How to diagnose

Use Get-VHD on the child to inspect its recorded parent path.
Find the original matching parent from the same checkpoint or backup chain; a file with the same name is not enough.
Do not merge or attach the child until the complete parent chain validates.

Get-VHD -Path "D:\VMs\child.avhdx" | Format-List Path,VhdType,ParentPath

Microsoft: Get-VHD

Microsoft: Set-VHD

Microsoft: Merge-VHD

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