I have a 411S@811S and have tried HSOP, HSOQ, HSOK - with all types of media from the RitekG04s to CMC MAGF01.....and only with HSOK do I get consistancy and no glitches.
There are always other influences on your burns other than the firmware, as raised earlier in this thread - media is always an issue, although at present it would seem that no matter the media my burns are consistant.
Have you thought about checking your data cables? I followed two suggestions that I was given in this regard, and although I cannot confirm whether they had a huge impact or not (because I did this at the same time as I modded the 411S to 811S) it certainly cannot of hurt. I have gone from getting 1 to 2 good burns out of 3 (using RitekG04 every time) to getting 100% success rate.
The two suggestions were:
[li]Install new data cables - may be a problem with old ones;
[/li][li]Install burner drive as Primary Slave and reader drive as Secondary Master - don't have both DVD drives on the same IDE Channel.
I hope that helps.
Here is a disc I did tonight - isn't she lovely??? Best KProbe reads ever! For a comparison I used same files and same procedure and software on two different media types:
This one burnt with Nero 126.96.36.199 at 4x on CMC MAGF01