def create_vdi( config )
raise ArgumentError.new('Invalid config') if config.nil?
raise ArgumentError.new('Missing virtual_size attribute') if config[:virtual_size].nil?
raise ArgumentError.new('Missing read_only attribute') if config[:read_only].nil?
raise ArgumentError.new('Missing type attribute') if config[:type].nil?
raise ArgumentError.new('Missing sharable attribute') if config[:sharable].nil?
raise ArgumentError.new('Missing other_config attribute') if config[:other_config].nil?
raise ArgumentError.new('Missing storage_repository attribute') if config[:storage_repository].nil?
config[:SR] = config[:storage_repository].reference
config[:name_label] = config[:name]
config[:name_description] = config[:description] if config[:description]
config.reject! { |k,v| (k == :__sr) or (k == :storage_repository) }
@connection.request({:parser => Fog::Parsers::XenServer::Base.new, :method => 'VDI.create'}, config )
end