- What Is Sions Default Dmg Type 10
- What Is Sions Default Dmg Type 1
- What Is Sions Default Dmg Type 3
- What Is Sions Default Dmg Type 8
- What Is Sions Default Dmg Type 2
The icon represents an internal hard drive within a generic file icon. | |
Filename extension | .dmg, .smi, .img |
---|---|
Internet media type | application/x-apple-diskimage |
Uniform Type Identifier (UTI) | com.apple.disk-image |
Developed by | Apple Inc. |
Type of format | Disk image |
Apple Disk Image is a disk image format commonly used by the macOS operating system. When opened, an Apple Disk Image is mounted as a volume within the Macintosh Finder.
An Apple Disk Image can be structured according to one of several proprietary disk image formats, including the Universal Disk Image Format (UDIF) and the New Disk Image Format (NDIF). An Apple disk image file's name usually has '.dmg' as its extension.
DMG file is a compressed file format being used widely on Mac computer. Windows OS doesn't natively support DMG disk image files, so if you need to create a bootable USB drive from a DMG file, mostly for bootable Mac OS X or macOS installation USB, you need a special utility to help you complete the task. DMG MORI is a worldwide leader of cutting machine tools for turning and milling, as well as a comprehensive supplier in additive manufacturing using powder nozzle and powder bed. DMG MORI USA - CNC machine tools for all cutting machining applications.
Features[edit]
Apple Disk Image files are published with a MIME type of application/x-apple-diskimage.
Different 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.[1] Some of the file systems supported include Hierarchical File System (HFS), HFS Plus, File Allocation Table (FAT), ISO9660 and Universal Disk Format (UDF).[1][2]
Apple 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. These utilities can also use Apple disk image files as images for burning CDs and DVDs. Disk image files may also be managed via the command line interface using the hdiutil utility.[3]
In Mac OS X v10.2.3, Apple introduced Compressed Disk Images[4] and Internet-Enabled Disk Images for use with the Apple utility Disk Copy, which was later integrated into Disk Utility in 10.3. The Disk Copy application had the ability to display a multi-lingual software license agreement before mounting a disk image. The image will not be mounted unless the user indicates agreement with the license.[5]
An 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.
History[edit]
Apple 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. Even as the use of resource forks declined with Mac OS X, disk images remained the standard software distribution format. 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.
A 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.[1] A similar format that supported compression of floppy disk images is called DART.[1][6]
New Disk Image Format (NDIF) was the previous default disk image format in Mac OS 9,[1] and disk images with this format generally have a .img (not to be confused with raw .img disk image files) or .smi file extension. Files with the .smi extension are actually applications that mount an embedded disk image, thus a 'Self Mounting Image', and are intended only for Mac OS 9 and earlier.[7][2]
Universal Disk Image Format (UDIF) is the native disk image format for Mac OS X. Disk images in this format typically have a .dmg extension.[1]
File format[edit]
Apple has not released any documentation on the format, but attempts to reverse engineer parts of the format have been successful. The encrypted layer was reverse engineered in an implementation called VileFault[8] (a spoonerism of FileVault).
Apple disk image files are essentially raw disk images (i.e. contain block data) with some added metadata, optionally with one or two layers applied that provide compression and encryption. In hdiutil these layers are called CUDIFEncoding and CEncryptedEncoding.[1]
UDIF supports ADC (an old proprietary compression format by Apple), zlib, bzip2 (as of Mac OS X v10.4), and LZFSE (as of Mac OS X v10.11)[9] compression internally.
Trailer[edit]
The trailer can be described using the following C structure.[10] All values are big-endian (PowerPC byte ordering)
Here is an explanation:
Position(in Hex) | Length (in bytes) | Description |
---|---|---|
000 | 4 | Magic bytes ('koly'). |
004 | 4 | File version (current is 4) |
008 | 4 | The length of this header, in bytes. Should be 512. |
00C | 4 | Flags. |
010 | 8 | Unknown. |
018 | 8 | Data fork offset (usually 0, beginning of file) |
020 | 8 | Size of data fork (usually up to the XMLOffset, below) |
028 | 8 | Resource fork offset, if any |
030 | 8 | Resource fork length, if any |
038 | 4 | Segment number. Usually 1, may be 0 |
03C | 4 | Segment count. Usually 1, may be 0 |
040 | 16 | 128-bit GUID identifier of segment |
050 | 4 | Data fork checksum type |
054 | 4 | Data fork checksum size |
058 | 128 | Data fork checksum |
0D8 | 8 | Offset of XML property list in DMG, from beginning |
0E0 | 8 | Length of XML property list |
0E8 | 120 | Reserved bytes |
160 | 4 | Master checksum type |
164 | 4 | Master checksum size |
168 | 128 | Master checksum |
1E8 | 4 | Unknown, commonly 1 |
1EC | 8 | Size of DMG when expanded, in sectors |
1F4 | 12 | Reserved bytes (zeroes) |
Utilities[edit]
There are few options available to extract files or mount the proprietary Apple Disk Image format. Some cross-platform conversion utilities are:
- dmg2img was originally written in Perl; however, the Perl version is no longer maintained, and the project was rewritten in C. Currently, without additional tools, the resulting images may be mounted only under Mac OS X and under Linux (provided hfsplus support has been enabled). UDIF ADC-compressed images have been supported since version 1.5.[11]
- DMGEXtractor is written in Java with GUI, and it supports more advanced features of dmg including AES-128 encrypted images but not UDCO images.[12]
- 7-Zip, including the free cross-platform port of its command-line interface, p7zip.
In Windows, most dmg images can be opened using several other programs such as UltraISO and IsoBuster. MacDrive can also mount simple dmg files as drives under windows, but not sparse disk or encrypted dmgs.[13] A free Apple DMG Disk Image Viewer also exists.[14]
In Linux and possibly other Unix flavors, most .dmg files can be burned to CD/DVD using any CD-burner program (using cdrecord directly or a front-end such as K3B or Brasero) or directly mounted to a mountpoint (e.g.
mount -o loop,ro -t hfsplus imagefile.dmg /mnt/mountpoint
).[15][16] darling-dmg is a FUSE module enabling easy DMG file mounting on Linux.[17]See also[edit]
References[edit]
- ^ abcdefg'hdiutil(1) Mac OS X Manual Page'. Archived from the original on 2016-05-14. Retrieved 2016-05-14.
- ^ ab'Mac OS X: Using Disk Copy disk image files'. Archived from the original on 2013-12-19. Retrieved 2013-04-25.
- ^
hdiutil(1)
– Darwin and macOS General Commands Manual - ^'Re: Some apps refuse to launch in 10.2.8! (OT, but very important)'. Archived from the original on 2014-01-17.
- ^'Guides'. Apple. Archived from the original on 2009-03-06. Retrieved 2010-10-27.
- ^'DART 1.5.3: Version Change History'. Archived from the original on 2013-12-19. Retrieved 2013-04-25.
- ^'Software Downloads: Formats and Common Error Messages'. Archived from the original on 2010-12-24. Retrieved 2009-05-06.
- ^'VileFault'. 2006-12-29. Archived from the original on 2007-01-09. Retrieved 2010-10-27.
- ^Michael Tsai (2015-10-07). 'LZFSE Disk Images in El Capitan'. Archived from the original on 2017-04-09. Retrieved 2017-04-09.
- ^'Demystifying the DMG File Format'. Archived from the original on 2013-03-17.
- ^'dmg2img'. Archived from the original on 29 November 2010. Retrieved 2010-10-27.
- ^'DMGExtractor'. Archived from the original on 2011-01-02. Retrieved 2011-01-03.
- ^MacDrive Features / Boot Camp / System Requirements /. 'MacDrive Home page'. Mediafour. Archived from the original on 4 October 2010. Retrieved 2010-10-27.
- ^Olivia Dehaviland (2015-03-03). 'Apple DMG Disk Image Viewer'. DataForensics.org. Archived from the original on 2015-04-02. Retrieved 2015-03-10.
- ^'How To Convert DMG To ISO in Windows, Linux & Mac'. Archived from the original on 2010-03-07.
- ^'Convert DMG To ISO using PowerISO'. Archived from the original on 2009-05-02. Retrieved 2009-02-15.
- ^'darling-dmg'. darling-dmg. Retrieved 29 March 2015.
External links[edit]
What Is Sions Default Dmg Type 10
- Apple Developer Connection A Quick Look at PackageMaker and Installer
- O'Reilly Mac DevCenter Tip 16-5. Create a Disk Image from a Directory in the Terminal
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Apple_Disk_Image&oldid=917998972'
Google Chrome is arguably the most popular browser used to surf the internet in the present time but most of us are unaware of the fact that there are four versions of the browser.
Yes, you read that right. Most of us work on the stable version, which is an end product of multiple tests run on other versions of the browser — Canary, Beta and Dev.
Every time an update has to be tested, it first rolls out these browser versions and later on when all the bugs are fixed and the update is stable, it’s rolled out for the Chrome browser used by millions.
Also Read: Top 21 Google Chrome Keyboard Shortcuts.Here we’ll be discussing how you can check which browser version you’re using and also how do the four versions of Google Chrome browser differ.
Chrome Versions
Stable
The stable version of Google Chrome browser is what you get if you simply search ‘download google chrome’, ‘google chrome’ or a similar keyword on Google search.
This version is used by a majority of Chrome users and is a result of extensive testing in other versions of the browser, making it the safest and most stable version of Chrome.
Beta
Chrome’s Beta version is one step before the updates are released for the stable build — which caters to millions of Chrome users.
Chrome beta is mostly stable, with a few minor bugs hampering its performance at times — which are then fixed before the update is rolled out to the stable build.
Beta is the final stage of testing the update, gets the final tweaks in user interface and gets tested for bugs before it is released to the wider audience on the stable version of Chrome.
Chrome Beta browser is updated every week by Google and receives a major update approximately every six weeks.
Dev
Chrome Dev is a step ahead of Beta and is slightly more unstable. This version is mainly used by the developers to test out big changes to the browser which may or may not make it to the Stable or even Beta version.
The Dev version of Chrome is more prone to crashes, errors, extension compatibility issues and more as the update on this version is still in its early stages with lots of bug fixes arising and pending fix.
Canary
Chrome Canary is the most unstable build of all the four versions as it’s updated regularly by Google’s servers automatically with the latest Chrome development code.
This version is basically used by developers to test compatibility issues. Most of the updates you see here won’t ever make it to the stable built.
An update is in its infancy when being tested on Canary.
Canary can be run independently alongside your stable version of Chrome on the same PC and will not interfere with the functioning of the latter.
How to Check Your Google Chrome Version?
Checking your current Google Chrome browser version is simple. Access the ‘three-dot’ menu in the top right of the browser.
Hover over to ‘Help’ in the dropdown and click on ‘About Chrome’. The new window will show the version of your browser, the first two digits in the string of numbers is the update number.
What Is Sions Default Dmg Type 1
In the browser shown in this image, the update number is Chrome58. While the stable version of Chrome browser uses the string of numbers, the other versions have ‘Beta’, ‘Dev’, ‘Canary’ after their respective number strings.
Also Read: How to Identify and Kill Chrome Tabs Eating Up RAM.What Is Sions Default Dmg Type 3
Another thing you’ll notice is ’64-bit’ or ’32-bit’ at the end of the version numbers. The Chrome version depends whether the machine you’re running is 32-bit or 64-bit.
64-bit version of the browser has enhanced security features.
Also SeeWhat Is Sions Default Dmg Type 8
#chrome #Google ChromeDid You Know
You can use the Chrome search bar as a calculator.