I’ll probably say a (very :D) stupid thing, but i have an idea that can fit with these strange results.
At least it has worked for me.
When my 20A1H and my external aluminium enclosure arrived to me 2 months ago, the first impression was"very nice, but too much vibrations !".
The thing was probably emphatized by the fact i had not the unit in a comuter case but in a little aluminium box.
However, first i tried some slow burning and scans, and i was not satisfied. I expected some result like the one in your review, but i had worst result.
I only used MMMC004 verbatim for these test, and these supports worked great with my old Nec 2500.
The first thing i tried was to reduce the vibration with the brown paper rings commonly used to secure HD : with one ring for each monting screw vibrations had been reduced, burns and scans improved (at that time i only made 8x scans, but since only recently i stared saving them i can not post these early results).
With 2 paper rings for each screw things improved greatly, but was hard to make them fit in the right place.
At the end i tried to reduce again vibration with a single 1cmx5cmx2mm neoprene adhesive strip below the unit. In that case things were getting worse, probably because it was too rigid and all che chassis was too tigh.
I think there was resonance instead of attenuation, since neoprene was too compressed.
My scans before the paper rings were like the one that [B]Cressida[/B] posted.
As I told you before, I never saved them, since i tought they were bad result and i wanted to improve things.
In the next days i’ll try to use some softer element (hard disk sponges) below the unit to improve again vibration reduction, but in the meanwhile i’m quite satisfied.
Hope this can help in finding a good solution for you and for all of them :D.
P.S. i enclose a 4x and 8x scan of a TY03 16x Verbatim DVD+R burned at 12x with the same unit, new C0deKing LLOD firmware, all on.
I don’t know if the 8x scans were good or not, you are the real experts, for me they are quite fine ;).