VHS to DVD conversion

Dubbed a home VHS tape (1989) to DVD. DVD inserted inside computer (MacBook) DVD drive; ran Roxio Toast. DVD will not mount on Desktop! Help!

Let’s start at the beginning. How did you transfer the VHS, what software, onto what computer Mac or Windows? What file extension did/does the video have on the hard drive? What software did you use to convert the video to a standard DVD structure? What burning software did you use? What brand of blank DVD? If the video that you burned to DVD is still on your hard drive does it play correctly form the hard drive? Which version Mac OS are you using?