ERROR_VHD_BLOCK_ALLOCATION_FAILURE 0xC03A0009

Hex 0xC03A0009 · Decimal -1069940727 · Type NTSTATUS

WINDOWS

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

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_VHD_BLOCK_ALLOCATION_FAILURE is a Windows error code (NTSTATUS 0xC03A0009) reported by Windows. Its official message is: “Failed to write to the virtual hard disk failed because the system failed to allocate a new block in the virtual hard disk.”

How to fix ERROR_VHD_BLOCK_ALLOCATION_FAILURE

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_VHD_BLOCK_ALLOCATION_TABLE_CORRUPTERROR_VHD_SPARSE_HEADER_CORRUPTERROR_VHD_INVALID_BLOCK_SIZEERROR_VHD_SPARSE_HEADER_UNSUPPORTED_VERSIONSTATUS_VHD_BLOCK_ALLOCATION_FAILURESTATUS_VHD_SPARSE_HEADER_CORRUPTSTATUS_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT

Source: Microsoft WinError.h

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