Format

Macintosh File System

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Summary

Name: Macintosh File System
Identifiers: PUID: fmt/2068
File extensions: mfs, IMG, DSK
Submitted by: Brigham Young University / Brigham Young University

Internal signatures

Macintosh File System

Provenance: v.121: new PUID.

Byte sequences

Min Frag Length: Absolute from BOF
Offset: 1024
Max offset: 0
Byte Sequence: D2D7{12}0004{6}[!&01]00
Endianness: None

Changelog

V122

Release date

19 January 2026
- Updated
  
  Macintosh File System: Added extensions IMG and DSK. Submitted by Brigham Young University.
V121

Release date

24 September 2025
- Added format
  
  Macintosh File System: Full entry added. Submitted by Brigham Young University.
- Added signature
  
  Macintosh File System: Signature researched and samples provided by Brigham Young University.