My DVD Writer does not read any CD or DVD,but the last time i used it i was burning an Window OS, two of them actually(2 OS),the second time i burned, that was the time my DVD cannot read any media,and i do think the reason why the problem occur because i simply chose x12 speed burning,i used Magic-ISO,but my portable DVD writer has only x8 speed,was that the problem?and is my DVD Writer done for good?