While the name MIME includes the word “Mail,” it is used for web pages as well. MIME types contain two parts: a type and a sub-type. The type describes the categorization of MIME types that are linked to each other. In contrast, a subtype is unique to a specific file type that is part of the 'type.'
In computing world, DMG or (Disk Image File) is a file extension that belongs to Mac OS X. DMG file can also be termed as Apple Disk Image.
The icon used equivalent to this file is an Internal Hard-drive. Disk Images are generally used worldwide in-order to distribute applications and software across the Internet. DMG file provides some attractive features that allow securing password along with file compression.These virtual or physical Apple disks can be cloned from one to another. This is one of the powerful features of Mac.Tip: If you want to open and of Apple Mac OS X so, you can try DMG Viewer tool.Why DMG Files Are Created?Earlier, Mac applications made use of Resource fork.
![Type Type](/uploads/1/2/5/6/125613873/958517247.png)
These are the part of file system on Mac Operating System, which consists of both the structured data and non-structured data. Mac could not transfer these Resource forks over the mixed networks. Hence, the usage of Resource fork dwindled and this was the reason that Apple created disk image formats(DMG). The Resource forks are very important as they contain Meta data regarding the file.
![File File](http://www.techjunkie.com/wp-content/uploads/2017/03/How-to-open-a-DMG-file-in-Windows3.jpg)
Mounting and Dismounting on Mac OSIt is equivalent to plugging in a removable drive, where E drive is automatically created and while removing one chooses ‘Safely Remove Device’. Similarly, you have to eject the Mac drive for both the virtual and physical.Two Disk Formats supported are:.
NDIFThis was previously used as the default format of Mac, also known as New Disk Format. These files generally have an.img file extension. UDIFThe native disk format of Apple Mac DMG file is UDIF (Universal Disk Image Format) with a file extension of.dmg.MIME Type of DMG File:application/x-apple-diskimage.
Supported File Systems. Hierarchical File System (HFS) – This was developed by Apple Inc. For the systems supporting Mac OS.
Earlier, these file systems were used in floppy disks and hard disks but later were used to read CD-ROM as well. It is known as Mac OS Standard.
HFS Plus – It was developed after HFS, which is an extension of the same.