Every DVD contains an image file that holds all data on the disk. This image file must be mounted onto the computer's hard drive for the DVD to run. You can mount a DVD in OS X by using the Disk Utility application. Disk Utility can mount any DVD image, including an ISO image. Mounting a DVD image can take up to several minutes for large files. Disk Utility will also verify the DVD to make sure there are no disk errors.
Click the Go menu in the OS X taskbar. Select the Utilities option.
Open the Disk Utility program in the list of applications.
Click File and then select Open Disk Image. Navigate the browser window to locate and select the DVD image you want to mount. Click the "OK" button. Disk Utility will mount the DVD image onto your desktop.
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