- COMPRESSED MAC OS X DMG HOW TO
- COMPRESSED MAC OS X DMG FOR MAC OS
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- COMPRESSED MAC OS X DMG SOFTWARE
contain block data) with some added metadata, optionally with one or two layers applied that provide compression and encryption. Īpple disk image files are essentially raw disk images (i.e. The encrypted layer was reverse engineered in an implementation called VileFault (a spoonerism of FileVault). File format Īpple has not released any documentation on the format, but attempts to reverse engineer parts of the format have been successful. Disk images in this format typically have a.
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Universal Disk Image Format (UDIF) is the native disk image format for Mac OS X. smi extension are actually applications that mount an embedded disk image, thus a "Self Mounting Image", intended only for Mac OS 9 and earlier. New Disk Image Format (NDIF) was the previous default disk image format in Mac OS 9, and disk images with this format generally have a. A similar format that supported compression of floppy disk images is called DART. Disk images allow the distributor to control the Finder's presentation of the window, which is commonly used to instruct the user to copy the application to the correct folder.Ī previous version of the format, intended only for floppy disk images, is usually referred to as "Disk Copy 4.2" format, after the version of the Disk Copy utility that was used to handle these images.
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Even as the use of resource forks declined with Mac OS X, disk images remained the standard software distribution format. Īn Apple Disk Image allows secure password protection as well as file compression, and hence serves both security and file distribution functions such a disk image is most commonly used to distribute software over the Internet.Īpple originally created its disk image formats because the resource fork used by Mac applications could not easily be transferred over mixed networks such as those that make up the Internet. The image will not be mounted unless the user indicates agreement with the license.
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The Disk Copy application had the ability to display a multilingual software license agreement before mounting a disk image. In Mac OS X v10.2.3, Apple introduced Compressed Disk Images and Internet-Enabled Disk Images for use with the Apple utility Disk Copy, which was later integrated into Disk Utility in 10.3. Disk image files may also be managed via the command line interface using the hdiutil utility. These utilities can also use Apple disk image files as images for burning CDs and DVDs. Īpple Disk Images can be created using utilities bundled with Mac OS X, specifically Disk Copy in Mac OS X v10.2 and earlier and Disk Utility in Mac OS X v10.3 and later. Some of the file systems supported include Hierarchical File System (HFS), HFS Plus, File Allocation Table (FAT), ISO9660 and Universal Disk Format (UDF). Then, use hdiutil to eject it, for example: hdiutil detach /dev/disk2s2.Apple Disk Image files are published with a MIME type of application/x-apple-diskimage.ĭifferent file systems can be contained inside these disk images, and there is also support for creating hybrid optical media images that contain multiple file systems. To eject, first find out what disk device it is associated to by typing “df”.
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How to eject a “.dmg” file using command line?
To attach a encrypted dmg file without having it pop up a GUI dialog, do hdid -stdinpass mydisk.dmg. If it is encrypted, a password GUI dialog will pop up. The disk image will show up at /Volumes/. How to open a “.dmg” file with commnand line tool? This will create a disk image with 5 mega bytes, using HFS+ format (OS X standard), and the name of the disk is “myDisk”, and the disk image file created is “myDisk.dmg”. To create one, use hdiutil, like this: hdiutil create -megabytes 5 -fs HFS+ -volname myDisk ~/Desktop/myDisk
For applications or executable files, it's better to use disk image format, because that way, all resource fork issues are done correctly, among other reasons. Mac OS X's disk image file format is called “ ” files. With disk image files, you can also create a image file of a CD, and that can be used to create a CD that is identical to the original CD.
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For example, you can create a zip version of all files on a CD, but that zip file can't be used by the OS to boot the machine. The OS will treat disk images just like a storage device, but a virtual one. Disk image is roughly a copy of the actual structure of disk.
“.dmg” file are files in Apple's disk image file format,įiles are different than compressed files. Line tools for Mac specific things, such as launching apps, put system to sleep, etc. This document explains Mac OS X's “.dmg” file, and some tips about using command
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