Format
Apple Disk Image
Summary
- Name
- Apple Disk Image
- Identifiers
-
- MIME: application/x-apple-diskimage
- Apple Uniform Type Identifier: com.apple.disk-image
- PUID: fmt/1071
- Format type
- Aggregate
- Description
- 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.
- File extensions
-
dmg - Source
- Datable / Datable
- Developed by
- Apple Computer, Inc.
- Supported by
- Apple Computer, Inc.
Relationships
- Has priority over
Internal signatures
Apple Disk Image
- Note
- EOF, 512 offset - 'koly' block header, 4 byte version (0x00000004), 4 byte size of header (0x00000200)
Byte sequences
- Min Frag Length
- Absolute from EOF
- Offset
- 500
- Max offset
- 0
- Byte Sequence
6B6F6C790000000400000200- Endianness
- None
Changelog
-
Updated in V115
- Release date
- 15 November 2023
Apple Disk Image: Max-offset of 0 bytes added for EOF signature. Submitted by Digital Preservation Department, The National Archives (UK).
-
Updated in V108
- Release date
- 5 September 2022
Apple Disk Image: Given priority over fmt/1740 and x-fmt/268. Submitted by The Church of Jesus Christ of Latter-day Saints and The Royal Danish Library.
-
Added in V91
- Release date
- 25 July 2017
Apple Disk Image: Signature developed with Henk Vanstappen, Datable.
Apple Disk Image: Full entry added. Submitted by Henk Vanstappen, Datable.