The reason I say that is the Drive kept retrying near the first track and just made the assumption. I have a DVD drive with no cover. Different disk starts to read at the beginning of the disk and then moved on.
This disk would just retry and then... it would look like there was no disk in the drive.
Same thing with DVDFab loaded, it would not even get to the Opening Disk, because no disk was found, and when I tried to force it, it would tell me that no disk was found.
Yet all 6 of my DVD players (not computers) would read the disk just fine.
I have to admit, I have no clue what was going on with the disk, but it was very strange. I have since requested a new disk and sent that disk back for the replacement. I will see if the new disk does this same thing. May be a bad disk... but then I just hope no one else discovers the secret of this disk.