I have a Samsung VCR/DVD combo that in years past I've used to transfer VHS tapes to DVD. I always used to be able to play those DVD's on my Mac, and later converted the movies so I could upload to Youtube.
Now, after a break of about three years, I've made a new DVD with it. The DVD works in the player, but in the Mac it appears as if there is nothing on it. Handbrake doesn't find anything.