Disc images are a fairly common packaging standard for large software programs. If you want to try out a new Linux distribution, for example, chances are you'll need to download a disc image in ISO format and burn it to a blank CD-ROM or DVD.
But ever since I began using Mac OS X, I've been perpetually confused about how to burn ISO images. I'm used to disc burning utilities that have an obvious, explicit command like "Burn ISO Image to CD." To make life even more confusing, OS X's Disk Utility does have a Burn command, but it becomes disabled when you click on the blank disc you'd like to use for the burn.
The problem here is that most Mac disc utilities, including the built-in Disk Utility, take a different approach when it comes to image burning. Instead of telling the program you want to burn an image, then choosing the file, you're supposed to do the reverse: You choose the file, then tell the program you want to burn it. So, to burn an ISO image to disc, here's what to do:
Mac OS X Hints