What does HRESULT 0xC03A000C (ERROR_VHD_BITMAP_MISMATCH) mean?

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Constant name:

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Description:

The virtual hard disk is corrupted. The block bitmap does not match with the block data present in the virtual hard disk.

Could be also:
Constant	Type	OS
STATUS_VHD_BITMAP_MISMATCH	NTSTATUS	Windows

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ERROR_VHD_INVALID_BLOCK_SIZE	ERROR_VHD_PARENT_VHD_NOT_FOUND

ERROR_VHD_BITMAP_MISMATCH

ERROR_VHD_BITMAP_MISMATCH means the virtual disk allocation bitmap does not agree with the block data that is present. Windows cannot safely determine which blocks contain valid data.

What to do

Treat the disk as structurally corrupted and protect the original from further writes.
Check the host storage and any interrupted snapshot, copy, or merge operation that occurred before the error.
Prefer restoring an internally consistent backup chain over attempting normal Hyper-V operations on the affected disk.

Microsoft: Test-VHD

Microsoft: VHDX file format specification

Microsoft: Merge-VHD

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