1878 Apple Disk Image Aggregate The Apple Disk Image is a disk image format commonly used by the macOS operating system, and is distinct from the earlier Apple Disk Copy Image 4.2. Please contact the PRONOM team if you are able to provide a more thorough description of this format. 224 Datable / Datable 17 Jul 2017 11/2023 (v.115)- Max-offset modified from null to 0. Internally researched. 14 Nov 2023 application/x-apple-diskimage MIME com.apple.disk-image Apple Uniform Type Identifier fmt/1071 PUID dmg File extension 1449 Apple Disk Image EOF, 512 offset - 'koly' block header, 4 byte version (0x00000004), 4 byte size of header (0x00000200) 1 Absolute from EOF 500 0 6B6F6C790000000400000200 Has priority over 388 BZIP2 Compressed Archive Has priority over 2586 Apple Partition Map Disk Image