It's also possible that your drive is damaged. Try to do a test of your burner.
Insert a blank media in the drive and run cd-dvd speed. Then select the "create disc" tab, and press the button start.
In this way the burner do a writing test filling the disc with casual data (yes, a disc loss, but necessary to do a test of your burner).
After test finish, press the little floppy button in the high right corner, and save the pic as PNG. Then post the pic here. In this way we can see what happen during the burn.