How do I copy a disk image using disk utility?
I have a copy of my idvd as a disk image, but when I open disk utility to burn it to a disk, I can't drag the destination disk to the destination box. What am I doing wrong?
How to copy previously-burned DVD-R video discs
http://support.apple.com/kb/HT2059
To create an image file, launch Disk Utility and select File: New: Disk Image From Folder. In the window that appears, navigate to the desired folder and then click on Image. Give the image file a name, and click on Save when prompted. That’s it.