This is a good thing as people can save a copy of the DMG file as a backup which can be used later to restore the previous state of the files. Disk images can be mounted on a computer just like a physical cd. The checksums for the zip file and the InstallESD.dmg disk image are listed in the CHECKSUMINFO.txt Addeddate 21:21:51 Identifier install-os-x-mountain-lion.app-10.8.4-10.8.5 Scanner Internet Archive HTML5 Uploader 1.6.4.However, that's only the bare minimum if you plan to install Mac OS X for day-to-day use, I recommend allocating at least 50 GB of space. DMG files can be customized according to the manufacturer’s wish so that the installers look pleasing when people download the files for installing software. Also, OS X Mountain Lion takes up about 10 GB of space on its initial installation, so the computer where you install Mac OS X must have at least 10 GB of space in its hard drive.Instead of sending more than one file over the internet, the creators have to send a single dmg disk image which contains all the required installation files of the software that can be simply dragged and dropped into the applications folder of Mac to install them.Click Continue to begin the process of installing or reinstalling OS X. A sheet appears informing you that your computer’s eligibility needs to be verified by Apple. The OS X Mountain Lion splash screen appears. This makes the software supplied inside the dmg secure from viruses as no one can alter the file after it is created. Select Reinstall OS X, and click Continue. DMG Images are read only which ensures that the files inside the installer are not altered with.Some tools can also convert DMG Files to windows-recognizable image files like. However, using some image softwares like Daemon tools on windows, we can mount disk images of DMG type on windows too. Disk Image Files are only meant to be used in Mac based systems and not on the Windows operating systems.

The newer disk image file was used in place of the original IMG or image file which was used in earlier versions of mac that are classic mac operating systems.

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