I am not complaining about the drive. It is Ritek R04 that I find disappointing, since Ritek R03 (8x) was pretty good at 12x overspeed. No wonder it is priced just a couple of dollars higher than R03. I just Qscan two more at 16x, one hit about 470 TE and another 450 TE. I think I'll have to use these as 12x.