What does NTSTATUS 0xC03A000D (STATUS_VHD_PARENT_VHD_NOT_FOUND) mean?

STATUS_VHD_PARENT_VHD_NOT_FOUND

STATUS_VHD_PARENT_VHD_NOT_FOUND is a differencing-chain result. A child records only changed blocks and relies on a parent for the remaining virtual offsets; the provider cannot complete that chain because it cannot locate the expected parent object.

This is different from STATUS_VHD_PARENT_VHD_ACCESS_DENIED, where the parent can be located but the opening process lacks access. It is also different from STATUS_VHD_CHILD_PARENT_ID_MISMATCH, where a candidate parent was found but its identity does not match the child's recorded expectation.

Recover the chain, not a filename alone

• Inventory every VHD, VHDX and AVHDX file that belongs to the checkpoint or backup set before changing any parent path.
• Use read-only inspection to record the parent locator and the chain order; file names and extensions are not proof of identity.
• Do not merge or mount the child read-write until the intended parent has been verified and the complete chain is available.

References

• Microsoft: VHDX differencing-disk overview
• Microsoft: VHDX parent locator
• Microsoft: Merge-VHD

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