https://forums.virtualbox.org/viewtopic.php?t=97564&sid=a:55f663e2a097af6d16226329b07fe644
COMException (0x80BB000C): Cannot close medium because it has 1 child media - virtualbox.org
https://forums.virtualbox.org/viewtopic.php?p=473271&sid=a:636ef049e7c0218f238c560aa334e835
COMException (0x80BB000C): Cannot close medium because it has 1 child media - virtualbox.org
https://learn.microsoft.com/pl-pl/dotnet/api/system.runtime.interopservices.comexception?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
COMException Class (System.Runtime.InteropServices) | Microsoft Learn
The exception that is thrown when an unrecognized HRESULT is returned from a COM method call.
class systemruntimemicrosoftlearn
https://forums.virtualbox.org/viewtopic.php?t=97564&sid=a:a846ca0d2dae3cc45859d56119a9c98c
COMException (0x80BB000C): Cannot close medium because it has 1 child media - virtualbox.org
https://forums.virtualbox.org/viewtopic.php?t=97564&sid=a:67aa86c3497fc8028dc12b17963b1b11
COMException (0x80BB000C): Cannot close medium because it has 1 child media - virtualbox.org
https://forums.virtualbox.org/viewtopic.php?t=97564&sid=a:636ef049e7c0218f238c560aa334e835
COMException (0x80BB000C): Cannot close medium because it has 1 child media - virtualbox.org