The format should remain as OS extended (journaled) if you plan to use the disk image with a Mac. If you intend to always leave the disk image in digital form, you can choose custom as the size. For example, if you are using a 80-minute CD-R disk, choose 663 MB (CD-ROM 80 min) if you're using a DVD-R disk, you'll most likely choose 4.6 GB (DVD-R, DVD-RAM). The size selection correlates to sizes of various writable CDs or DVDs so make your selection based on the type of media you intend to store it on. To create a new disk image, in Disk Utility simply click the New Image icon at the top, and complete the prompts.ĭMG files can be used to store files or applications, as shown above. DMG: More Than Meets the EyeĪpple disk images are also handy because they can store files or applications for transferring to other computers or archiving.
To burn a DMG file to a CD or DVD, mount the disk image to Disk Utility, select it, and then click Burn. Depending on the size of the disk image, and the speed of your writing drive, you will have your freshly minted disk in a matter of minutes. You will be prompted to insert your blank media, after which you can then click Burn to confirm that you wish to write the DMG to the disk. To burn the disk image to a CD or DVD, simply click the DMG file in the left sidebar, and then click the Burn icon at the top of Disk Utility. To mount a DMG disk image in OS X, simply drag-and-drop it to the left sidebar of Disk Utility. It will be mounted as a disk and then be available to compress, mount, encrypt or burn.
To add a DMG to Disk Utility, simply drag it to the left-side menu of Disk Utility where the other mounted drives are listed (hard drive, SuperDrive, etc.). The best tool for interacting with DMG is Apple's own Disk Utility. These DMG files are quite flexible within OS X, but are rarely used outside of the typical context of dragging a newly downloaded file to the Applications folder. Prior to the introduction of the App Store, Apple often used disk image files specifically designed for OS X-called DMG files-to install applications. How to Burn a CD or DVD from a Disk Image in OS X
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