DVD Image vs DVD Copy

"In theory making an image of the DVD should be faster than just copying the files and directories, since the image copy is done on a sector-by-sector basis and does not waste time on following the files through the file system.

There are no numbers that I could find for reading the DVD, but some burner programs claim that writing an iso is 6-7 times faster than copying the files/directories. It seems logical that the reverse operation should also be faster for the same reason."