What does HRESULT 0xC03A0017 (ERROR_VHD_CHILD_PARENT_SIZE_MISMATCH) mean?

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The chain of virtual hard disks is corrupted. There is a mismatch in the virtual sizes of the parent virtual hard disk and differencing disk.

Could be also:
Constant	Type	OS
STATUS_VHD_CHILD_PARENT_SIZE_MISMATCH	NTSTATUS	Windows

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ERROR_VHD_PARENT_VHD_ACCESS_DENIED	ERROR_VHD_DIFFERENCING_CHAIN_CYCLE_DETECTED

ERROR_VHD_CHILD_PARENT_SIZE_MISMATCH

ERROR_VHD_CHILD_PARENT_SIZE_MISMATCH means the virtual size of the parent disk does not match the value expected by its child. The parent is likely wrong or was modified after the child was created.

How to handle it

Recover the parent and child from a single consistent checkpoint or backup chain.
Inspect virtual sizes and parent paths with Get-VHD before any attach or merge attempt.
Do not resize the parent to force the values to match; that can make existing child data unrecoverable.

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

Microsoft: Get-VHD

Microsoft: Set-VHD

Microsoft: Merge-VHD

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