static void Main(string[] args)
        {
            if (args.Count() > 0)
            {
                Console.WriteLine(args);
            }

            CD  cd  = new CD("Lamb of God", 500, 300);
            DVD dvd = new DVD("Cloverfield", 1500, 1400);

            cd.SpinDisc();
            dvd.SpinDisc();

            cd.ReadData();
            dvd.ReadData();

            Console.WriteLine(cd.WriteData(200));
            Console.WriteLine(dvd.WriteData(100));

            Console.WriteLine(cd.Info());
            Console.WriteLine(dvd.Info());

            //should throw because the disc is full
            //Console.WriteLine(cd.WriteData(1));
        }