Механическая. https://yandex.ru/images/search?img_url=http%3A%2F%2Fmy-bookshop.ru%2Fimage%2Faudio_cd_covers%2F1005348273.jpg&p=1&text=%D1%82%D0%BE%D1%87%D0%B8%D0%BB%D0%BA%D0%B0%20%D0%B4%D0%BB%D1%8F%20%D0%BA%D0%B0%D1%80%D0%B0%D0%BD%D0%B4%D0%B0%D1%88%D0%B5%D0%B9%20%D0%BC%D0%B5%D1%85%D0%B0%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F%20%D0%BD%D0%B0%D1%81%D1%82%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F&noreask=1&pos=49&rpt=simage&lr=213всё остальное...компромисс.