ISO disk images, though not specific to use with OS X, work similarly to DMG files. For a more widely accepted alternative, look to the ISO filetype, named for the ISO 9660 file system commonly used on CD-ROMs. Since DMG's are designed for OS X, if you intend to take use a disk image on a non-Apple computer, they may prove difficult to work with. Tip: If you need to eject (or unmount) a disk image from Disk Utility, simply click and drag it off of the left sidebar of the app it will poof away just like a discarded Dock app. Be sure to burn the DMG to a CD or DVD, or store it on a flash drive before ejecting the disk image. The DMG will be mounted to your desktop and in Disk Utility and be ready to accept your contents. Once finished, click Create to make the disk image. When creating a disk image, you'll be given the option to choose the size, format, partition type, and whether or not you want to encrypt the image.
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Change it to MS-DOS (FAT) if you wish to use it on a Windows PC or Linux.įinally, you can choose whether or not to encrypt the volume and the partition scheme, though if you choose a disk image size that correlates to a CD or DVD, the CD/DVD partition scheme will automatically be selected. 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.
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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.
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How to Burn a CD or DVD from a Disk Image in OS X
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