What does HRESULT 0xC03A000A (ERROR_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT) mean?

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Description:

The virtual hard disk is corrupted. The block allocation table in the virtual hard disk is corrupt.

Could be also:
Constant	Type	OS
STATUS_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT	NTSTATUS	Windows

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ERROR_VHD_BLOCK_ALLOCATION_FAILURE	ERROR_VHD_INVALID_BLOCK_SIZE

ERROR_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT

ERROR_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT means the mapping that tells Windows where virtual disk blocks are stored is corrupt. The virtual disk should be treated as unavailable until recovered from a known-good source.

Safe handling

Avoid mounting the image read-write or starting a VM that depends on it.
Preserve all files in the chain and compare them with a backup set from the same point in time.
Use Test-VHD to document the fault, then restore or recover on copies rather than modifying the failed file in place.

Test-VHD -Path "D:\Recovery\disk.vhd"

Microsoft: Test-VHD

Microsoft: VHDX format overview

Microsoft: Manage virtual hard disks

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