I wasn't suggesting you were insulting anyone.
You're clearly getting some decent quality burns so get some file comparison software as I've indicated & do some tests to reassure yourself that the data is being written accurately, it almost certainly is.
Once you're comfortable that the DATA is accurate ( it doesn't matter whether it's data files/video files or whatever) then in future after you burn do a disc quality scan to check that the burn quality is OK. End of story.
Note that some DVD writing packages will modify the ifo/bup files (particularly the timestamp) so errors here are acceptable.
If you're burning image files (ISO/BIN/NRG/IMG etc) then to be able to compare the data you'll need to mount the image on a virtual drive so it then appears that you're doing disc comparisons. I use Daemon Tools for this.
I understand that before you delete something from your HDD that you need to be sure that it's safely copied - we all need that comfort - so hopefully doing what I've suggested will give you the comfort you need & that you'll be able close this issue & worry about something else.
Please note that nothing I write is ever intended to cause any offence although it may appear that way. Just ask my kids about this , I say something innocent & they take totally the wrong way.