With OS X El Capitan (10.11), Apple removed the burning feature in Disk Utility. Instead, you can now burn disc images directly from Finder. Because this works on previous versions of OS X too, the Finder method is now the universal method for burning an ISO or DMG file to DVD.
- Insert a blank disc in your DVD writer.
- Open the folder in Finder that contains your ISO or DMG file.
- Right-click the file and choose “Burn Disk Image”
- Click Burn. Sit back and relax as OS X creates the DVD for you from the the ISO or DMG file.
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