Okay, more precisely, I have the win-explorer open (listing C drive
Now, doing a data backup - when finished looking at the DVD contents by clicking on the dvd device in explorer's left pane I see the old contents listed (file dates) and not the new files. Cycle the tray and the contents is updated.
Form Vista and XP days I was used to see the new contents listed (after a backup) without tray cycling by clicking on the DVD device in the left pane
hope this is clearer