correct Cynthia and also,
your using crappy Dual Layer media (Disc ID: CMC MAG-D03-64)
only use Verbatim or Taiyo Yuden... why?
read --> Here!
PLus, there's an update firmware for your LG Burner...
your at version CL00, but version CL01 is out!
install it, its important to always have the latest....
find it --> Here!
and this warning message,
Duplex Secure's SPTD driver can have a detrimental effect on drive performance
tells me you have Alcohol or Daemon Tools installed...
and make sure the SPTD driver is uninstalled too...
To remove SPTD, simply download SPTD setup file "Here!" and execute it.
In dialog that appears press "Uninstall" button and then SPTD will remove itself from your Windows installation.
only then, ImgBurn wont show you that warning message
and it'll improve your burning sessions overall!
after that, if you need to mount images in general,
use Virtual Clone Drive or DVDFab Virtual Drive...
these 2 dont use the SPTD driver,,,