While DMG files are usually downloaded from the Mac App Store, they can also be burned to a USB disk when you want to install a utility on another machine. DMG file is usually encrypted and compressed, unlike ISO, which is an uncompressed disk image format. When opened, it mounts a virtual disk on the computer, and is normally used for installing new applications. This tip is particularly useful if you have a CD/DVD burner on a Mac (or PC) and not a PC (or Mac) and you need to burn a disk image using the other machine.Ī DMG file is essentially Apple's format for mountable disk images in Mac OS X (macOS) computers. Hdiutil convert /path/imagefile.iso -format UDRW -o /path/convertedimage.dmg. Using hdiutil for such a task is helpful for scripting or remote connections through SSH. Man Diskutil Mac Create Dmg File Windows 7Ī helpful command line tool called hdiutil is included in Mac OS X that allows disk image files (.dmg extension) to be mounted directly from the Terminal, without the need of using the GUI.
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