My earliest ones still read. My later ones mostly don't. I'm guessing the difference is the earlier ones were recorded at 2x speed (fastest that existed) while

My earliest ones still read. My later ones mostly don't. I'm guessing the difference is the earlier ones were recorded at 2x speed (fastest that existed) while the later ones were recorded much faster (probably 8x or 12x), which means less laser burn in time? Really not sure. Either that or the yamaha drive was just much better than the later model plextor.