Also I wrote the DVD Image and a DVD folder and each of them gave a similar end of file pop up the moment the data written was complete and the time remaining was at 1 second.
That is not good. I am assuming the disk is not being finalized in some way. The same problem appears to happen with the image/folder. It is possible that the resulting file(s) will burn to a disk that is correct, but I would be very worried.
I have to think this is a permissions issue. The common issue for PCs is the "run as administrator." Macs more often has a disk permissions issue. Creating a new user sometimes gets the job done.
Look at any suggestions here that give guidance for users/permissions.
Troubleshoot system errors and freezes | Adobe software on Mac OS 10.x