LG4040B burn problem!

Hi

I have this old LG4040B drive and I recently noticed
that there is some black spots on the Write mark of an dvd-r
but when burned with LG4167B “the new drive” the write mark is perfect and bright no black spots to be seen…

why is my LG4040B doing this? is the drive about to fail?
anyways My dvd player is having problems in reading discs wich were burned with the drive, but the discs wich I burn with my new drive works Flawlessly…

I use Verbatim “TYG02” Tayo Yuden brand… and Also with ps2 I use TDK branded TTG02 media.

-Pete