IMAGE File Documentation

Overview

Feature Value
Format Name Apple Disk Image
File Extension .dmg
MIME Type application/x-apple-diskimage
Developer Apple Inc.
Compression Support Yes
Encryption Support Yes
Maximum File Size Depends on the file system within the image
File System Formats Support APFS, HFS+, FAT, exFAT, NTFS
Primary Usage Software distribution, system backups, file archiving
Readable by macOS Version Mac OS X 10.3 and newer
Writable by macOS Version Mac OS X 10.3 and newer
Security Features Checksum, encryption options
Supported Partition Schemes GPT, MBR, Apple Partition Map
Volume Mounting Read/Write, Read-Only, or Compressed
Compression Algorithms Zlib, bzip2, LZMA, LZFSE, ADC
Unique Features Internet-enable, which allows downloading sections as needed
Package Type Support Single File or Bundle
License Proprietary
Multi-volume Support No
Metadata Storage Yes