This is useful if you deleted the iso off of your computer and need it again. Note this wouldn't work with originals, you can try but it wouldn't work.
Things Needed
-ImgBurn
-A Backup of Your Choice
You need to be careful with this because many factors can cause a bad backup. For example, Scratchs on the DVD, Quality of the DVD-R and the speed it was burnt. if cared your DVDs, Burnt them at low speeds on Verbatim DVD-R or any other high quality DVD-R (not +R) then you shouldn't get a bad dump. Before you start insert the DVD into your DVD Drive.
1) Open Up ImgBurn and Select 'Create Image file from disc'
2) Make sure the source is where you inserted the DVD. The Label should show the name of the game.
3) Under Destination, Browse for the place you would like to save the .iso and name it whatever you like.
4) Press the button below to start Reading the disc.
5) ImgBurn should now begin reading the disc. Allow it to finish with no errors or intervention. You should get a pop-up saying Operation Successful.
OPTIONAL
You could try dragging the iso onto IOSPatcher and opening it with WiiScrubber to see if they both are able to read the iso.