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 - Submitted by
- Datable / Datable
- Developed by
- Apple Computer, Inc.
- Supported by
- Apple Computer, Inc.
Relationships
- Has priority over
Internal signatures
Apple Disk Image
- Description
- EOF, 512 offset - 'koly' block header, 4 byte version (0x00000004), 4 byte size of header (0x00000200)
- Provenance
- 11/2023 (v.115)- Max-offset modified from null to 0. Internally researched.
Byte sequences
- Min Frag Length
- Absolute from EOF
- Offset
- 500
- Max offset
- 0
- Byte Sequence
6B6F6C790000000400000200- Endianness
- None
Changelog
-
V115
- Release date
- 15 November 2023
-
Updated
Apple Disk Image: Max-offset of 0 bytes added for EOF signature. Submitted by Digital Preservation Department, The National Archives (UK).
-
V108
- Release date
- 5 September 2022
-
Updated
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.
-
V91
- Release date
- 25 July 2017
-
Added format
Apple Disk Image: Full entry added. Submitted by Henk Vanstappen, Datable.
-
Added signature
Apple Disk Image: Signature developed with Henk Vanstappen, Datable.