def copy_sizes(self, othervd):
        # type: (PrimaryOrSupplementaryVD) -> None
        '''
        Copy the path_tbl_size, path_table_num_extents, and space_size from
        another volume descriptor.

        Parameters:
         othervd - The other volume descriptor to copy from.
        Returns:
         Nothing.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('This Volume Descriptor is not yet initialized')

        self.space_size = othervd.space_size
        self.path_tbl_size = othervd.path_tbl_size
        self.path_table_num_extents = othervd.path_table_num_extents
Copy the path_tbl_size, path_table_num_extents, and space_size from
        another volume descriptor.

        Parameters:
         othervd - The other volume descriptor to copy from.
        Returns:
         Nothing.