If PoweRec is disabled where the drive 'doesn't know' the disk, that could be very bad. However, so long as someone's tested burns with p/r off and sees that either errors are acceptable (or in some cases even better), p/r can be disabled. I have to do that, since with p/r on, my px-716a tries to burn Fuji 8x DVD+R MIJ (Yudenty000-t02-00) at 16x and unfortunately did improve on them after 3 burns. (I think the a/s p/r must have been calibrated for the non-branded Taiyo Yuden of the same MID, as someone posted they're rated at 8x but can be burned beautifully at 16x with p/r on.) So, I disable p/r, then open CopytoDVD Manager to set the burn speed to 12x...and I get almost the same burn on the ty000-t02-00 as I would at 8x (p/r also disabled). Curiously, I found that the 'maximum speed' without huge error spikes for this media is 12.97x. I emailed Plextor (US) with the data, but only God knows if they'll put it into the next fw... Curiously, though, you have to disable p/r in Plextools before you burn, and you have to repeat it if you reopen Plextools for some reason or restart your computer, as it's obviously the default setting to have it on. However, always leave Autostrategy enabled, and after you disable p/r, use the A/S Media quality check: insert a blank media and test it at the speed you want to burn it at (up to 12x) to see if A/S says you can.