# Amiga Disk image File (OFS)

> file format

**Wikidata**: [Q105857701](https://www.wikidata.org/wiki/Q105857701)  
**Source**: https://4ort.xyz/entity/amiga-disk-image-file-ofs

## Summary
Amiga Disk image File (OFS) is a file format that represents a disk image based on the Amiga Disk image File (generic) standard. It uses the .adf file extension and contains the contents and structure of a disk volume in a single file.

## Key Facts
- File extension: .adf
- Instance of: disk image
- Based on: Amiga Disk image File (generic)
- File format identification pattern: 444F5300 (hexadecimal) at the beginning of the file
- Described at URL: https://en.wikipedia.org/wiki/Amiga_Disk_File
- Wikidata description: file format

### Q: What is the file extension for Amiga Disk image File (OFS)?
A: The file extension for Amiga Disk image File (OFS) is .adf, as documented in file format identification sources.

### Q: How can you identify an Amiga Disk image File (OFS)?
A: Amiga Disk image File (OFS) can be identified by its file format signature of 444F5300 in hexadecimal at the beginning of the file.

### Q: What type of file is Amiga Disk image File (OFS)?
A: Amiga Disk image File (OFS) is a disk image file format that contains the contents and structure of a disk volume.

## Why It Matters
Amiga Disk image File (OFS) serves as a crucial preservation format for Amiga software and data, allowing users to store and distribute entire disk contents as single files. This format enables emulation of Amiga systems, software archiving, and distribution of classic Amiga programs without requiring physical media. The .adf format has become a standard for sharing Amiga disk images across various platforms and emulators, making it essential for retro computing enthusiasts and preservationists working to maintain access to Amiga software libraries.

## Notable For
- Standard file format for Amiga disk images
- Enables emulation of Amiga software without physical media
- Uses distinctive 444F5300 file signature for identification
- Based on the generic Amiga Disk image File standard
- Supports preservation and distribution of classic Amiga software

## Body
### Technical Specifications
Amiga Disk image File (OFS) follows the generic Amiga Disk image File standard, maintaining compatibility with Amiga emulation software. The format stores complete disk contents including boot sectors, file allocation tables, and directory structures.

### File Identification
The format uses a specific hexadecimal signature (444F5300) at the beginning of the file for identification purposes. This signature helps file analysis tools recognize and properly handle .adf files.

### Usage Context
The .adf format is primarily used for:
- Software preservation and archiving
- Amiga system emulation
- Distribution of classic Amiga games and applications
- Backup and storage of Amiga disk contents

### Format Structure
As a disk image format, OFS maintains the logical structure of Amiga floppy disks, including:
- Boot block information
- File system metadata
- Directory structures
- File contents in their original organization

### Compatibility
The format is widely supported across:
- Amiga emulation software
- Disk image management tools
- File format identification utilities
- Retro computing preservation platforms

## References

1. [TrID](https://mark0.net/soft-tridscan-e.html)