HRESULT 0xC03A0019: meaning and diagnosis

Status / error code:

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Description:

The chain of virtual hard disks is inaccessible. There was an error opening a virtual hard disk further up the chain.

Could be also:
Constant	Type	OS
STATUS_VHD_DIFFERENCING_CHAIN_ERROR_IN_PARENT	NTSTATUS	Windows

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ERROR_VHD_DIFFERENCING_CHAIN_CYCLE_DETECTED	ERROR_VIRTUAL_DISK_LIMITATION

ERROR_VHD_DIFFERENCING_CHAIN_ERROR_IN_PARENT

ERROR_VHD_DIFFERENCING_CHAIN_ERROR_IN_PARENT means the child disk could not be opened because an earlier parent in the chain has its own error. The visible child is not necessarily the damaged file.

Diagnostic order

Start with the leaf disk and inspect ParentPath, then validate each parent one level at a time.
Resolve the first failing parent before attempting to attach or merge any child.
Keep the whole chain together; moving one file without its parents complicates recovery.

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

Microsoft: Get-VHD

Microsoft: Test-VHD

Microsoft: Merge-VHD

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