Toast was about the only authoring software to make DVD burners work at all.  Disc burning n OS X was hit or miss on non apple drives, usually miss.  Don't forget they had DVD ram drives to really confuse the issue.

Usually you had to set up whatever you wanted to burn in toast then start the burn and it would ask for the disc to be inserted.  Its not like now you can use a disk thats inserted.  Imagine its like disc copy for floppies.  Set up the copy then "insert floppy".

Also if it does not finalize at the end of the burn correctly its a coaster, was very expensive learning curve when disks were like 10 dollars a piece.