What I think of these result is that 811s do not have problem reading all RICOH discs at 4x speed. At least, that same drive can read one RICOH discs burned on different burner fine. Problem must be due to the burning quality of that first disc.
My guess is that the errors came down to problem with tracking the discs. If you notice that when you lock 4x scan, the drive start scanning at 4x. But compared with Max or 2x scan, the drive will start scanning at 2x. One possibility is that at 4x speed, 811s have problem reading/tracking inner portion of discs that is burned poorly. And that also caused subsequent error as disc reading progress. In this case, discs burned from 811s. Maybe burning strategy of these media in 811 is to blame.
Some other models/drives may report errors differently. Due to the fact that 2 different models/drives may have different reading strategy (perse), problem can be seen more serious than other. This same disc i have problem probably give me a better result on a 411s like most people saw. But we know that at least on 811s, it does have problem reading at 4x. I'm not saying that the disc i burned in 811s will have problem in a set-top. Actually that disc plays fine on my player.
In mean time, i'll continue burn all my RICOH discs on the NEC. From the results i saw, at least it's more reliable than 811 at the moment.
Sorry if this thread turns out to be such a waste.