if your DVD is D-5 (means the DVD data size is around 4.5GB)
then
1. simplyburns rip DVD into a 4.5GB *.iso. you can then use simplyburns to burn this *.iso to a blank DVD
2. mactheripper rip DVD into a Movie folder, you can watch this through any dvd player, also you can burn it to DVD using DVD remaster. or use DVD imager to make movie folder into a *.iso, then burn as described in "1"
if you DVD is D-9, which has z size larger than 4.7GB
1. mactheripper rip DVD into a movie folder, then use DVD remaster or FFmpegx to compress the folder into a 4.5Gb .iso then burn.
2. buy a DVD-9 blank disk, burn it, remember DVD-9 disk is much more expensive than DVD-5 disk.