My Future Wife's favorite DVD recorder (Samsung DVD-R120) simply refused to open the door/tray one day. So I agreed to take a look at it. After fiddling around a bit, as near as I can figure the belt is finally worn out. If I remove the DVD drive cover (with the magnetic disc) from the equation, the drive functions perfectly. Replace the cover, and it refuses to open.
I believe the strength of the magnet is too much for the worn belt to overcome.
So... where might I source a replacement belt?
Note, this isn't a computer drive. It's an actual DVD player/recorder deck.