What does HRESULT 0xC03A0009 (ERROR_VHD_BLOCK_ALLOCATION_FAILURE) mean?

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ERROR_VHD_BLOCK_ALLOCATION_FAILURE failed to write to the virtual hard disk failed because the system failed to allocate a new block in the virtual hard.

Could be also:
Constant	Type	OS
STATUS_VHD_BLOCK_ALLOCATION_FAILURE	NTSTATUS	Windows

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ERROR_VHD_SPARSE_HEADER_CORRUPT	ERROR_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT

ERROR_VHD_BLOCK_ALLOCATION_FAILURE

ERROR_VHD_BLOCK_ALLOCATION_FAILURE means Windows could not allocate a new physical block while writing to a dynamic or differencing virtual disk. The immediate cause is usually on the host storage path rather than inside the guest.

What to check

Check free capacity, quotas, thin-provisioning limits, and storage alerts on the host volume that stores the VHD/VHDX.
Check whether a checkpoint chain or rapidly growing dynamic disk exhausted available host space.
Review host event logs and the underlying storage subsystem for I/O failures before retrying writes.

Get-Volume | Select DriveLetter, SizeRemaining, Size

Microsoft: Manage virtual hard disks

Microsoft: Optimize-VHD

Microsoft: Hyper-V antivirus exclusions

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