As for the burning speed the lowest in this drive is x8 and when i burn at that speed the noise is less then in higher speeds. I always burn at x8 because of this problem but it isn't help.
NO....your drive can support 1X & 2X if you want to, Nero doesn't have this option but burnatonce have it!
modern drives actually support 1X recording, many of us just don't aware of it
Maybe your drive laser is dying?
If its a aged laser, use long strategy disc will help
as long strategy discs are more tolerable with laser power
slightly innaccurate laser power will also produce a OK burn
those Cyanine and Azo
You said you used Verbatim
Is it Verbatim or Verbatim DataLifePlus
Verbatim DataLifePlus are long strategy (Azo) disc
You only have problems when burning VCD/CD right?
VCD/CD do not have additional error correction on them, a bad burn with C2 will cause noise etc etc
DataCD is different, if you have C2 , you can still get back the data as it has filesystem correction
that's why you can burn 800MB data to VCD/Cd but only 700MB for DataCD! the 100MB is reserved for correction