LG DVD writer GH22NS50 is not writing in empty DVD but writes in DVD-RW
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May 18, 2010 8:36:25 PM
Maybe the laser is on the way out -- the two different media work differently which might account for the fact that one is responding to the laser and the other not.
I would try cleaning the laser lens. There are cleaner discs available but I prefer to dismantle the drive and use a baby cotton stick held at one end to avoid pressure on the focus mechanism. Use a gentle solvent (alcohol) and dry off with the other end of the cotton wool stick.