Join cross-platform.001,.002. Files back into a single file. Change the passphrase of an existing encrypted.dmg,.sparsebundle, or.sparseimage disk image. Compression and encryption are optimized for multi-core processors, and DropDMG runs multiple operations simultaneously, so you can keep working while it processes in the background. LZFSE is Apple’s proprietary compression algorithm, matching the compression ratio of zlib level 5, but with much higher energy efficiency and speed (between 2x and 3x) for both encode and decode operations. Use LZFSE when compressing a payload for iOS, macOS, watchOS, and tvOS. 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.

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Open DMG File

DMG is used for disk image files on Macintosh computers running Mac OS X. This file extension replaces the older file extension IMG which was discontinued during the release of later series of Mac operating systems. You can open DMG file on Mac, Linux, and Windows operating systems but it will require additional software to be installed on Windows. Note that on Windows and Linux you cannot open every DMG file, since there are certain software limitations on DMG format variation.

DMG files are used by Apple for software distribution over the internet. These files provide features such as compression and password protection which are not common to other forms of software distribution file formats. DMG files are native to Mac OS X and are structured according to Universal Disk Image Format (UDIF) and the New Disk Image Format (NDIF). They can be accessed through the Mac OS Finder application by either launching the DMG file or mounting it as a drive.

DMG is also referred to as the Apple’s equivalent to MSI files in Windows PC. Non-Macintosh systems may access DMG files and extract or convert them to ISO image files for burning. Several applications are designed to offer this solution for Windows systems.

7-Zip and DMG Extractor are the best options to open DMG file on Windows because they are compatible with the most DMG variations. For Linux a built-in 'cdrecord' command can be issued to burn DMG files to CD's or DVD's.

Aside from the Finder application, you can open DMG files through Apple Disk Utility, Roxio Toast, and Dare to be Creative iArchiver for Mac platform. On the other hand, additional applications such Acute Systems TransMac, DMG2IMG, and DMG2ISO can be installed on Windows to fully support the files.

Read how you can open DMG files on Mac OS, Windows and Linux.

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DMG files are transferred over e-mail or internet using application/x-apple-diskimage multipurpose internet mail extensions (MIME) type.

Following file types are similar to DMG and contain disk images:

• ISO File - ISO disk image file
• IMG File - IMG disk image file
• VHD/VHDX File - Virtual Hard Drive image file

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Disk Utility User Guide

You can convert the image format and encryption of a disk image.

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For example, if you create a read/write disk image but later want to prevent changes to the image, you can convert it to one of the read-only disk image formats.

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1. In the Disk Utility app on your Mac, choose Images > Convert, select the disk image file you want to convert, then click Open.

2. Click the Image Format pop-up menu, then choose a new image format.

   • Read-only: The disk image can’t be written to, and is quicker to create and open.

   • Compressed: Compresses data, so the disk image is smaller than the original data. The disk image is read-only.

   • Read/write: Allows you to add files to the disk image after it’s created.

   • DVD/CD master: Can be used with third-party apps. It includes a copy of all sectors of the disk image, whether they’re used or not. When you use a master disk image to create other DVDs or CDs, all data is copied exactly.

   • Hybrid image (HFS+/ISO/UDF): This disk image is a combination of disk image formats and can be used with different file system standards, such as HFS, ISO, and UDF.

3. If you want to change the encryption, click the Encryption pop-up menu, then choose an encryption type.

4. Enter a new name for the image in the Save As field, click Save, then click Done.

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