Creating .isos on the Mac

Is it already an .ISO file or do you need to create the .ISO?

If it is already created, just use Disk Utility as described here.

You can also use Disk Utility to create the image. Launch it, then open file -> new and go from there.

 

ISO disk images are only used on Windows. Using Disk Utility makes Mac OS DMG image files, not ISO files.

 

No they're not. It's the standard file format for sharing images of CDs (windows, linux, etc). The name is just shorthand for the ISO 9660 standard for CDs.

 

I should have put the word "generally" in there...

There is very limited support for ISO files on Mac OS. And, as I said earlier, Disk Utility still only will make DMG images. I don't think it will even read ISOs. In fact, I think you need to purchase Toast or use some other third party app to actually do anything with ISOs on a Mac. I don't recall ever successfully reading, creating, or burning an ISO image file on a Mac.