# HAMMER

> file system from DragonFly BSD

**Wikidata**: [Q2498917](https://www.wikidata.org/wiki/Q2498917)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HAMMER_(file_system))  
**Source**: https://4ort.xyz/entity/hammer

## Summary
HAMMER is a file system developed by DragonFly BSD and its creator, Matthew Dillon, in 2008. It is designed to provide efficient storage and retrieval of files and directories on data storage devices, serving as a concrete format for organizing data.

## Key Facts
- **Instance of**: File system, free software
- **Developed by**: DragonFly BSD and Matthew Dillon
- **Inception**: July 21, 2008
- **License**: 3-clause BSD License
- **Operating system**: DragonFly BSD
- **Followed by**: HAMMER2
- **Aliases**: HAMMER.5, HAMMER(5), HAMMER.8, HAMMER(8), HAMMER1
- **Website**: [http://www.dragonflybsd.org/hammer/](http://www.dragonflybsd.org/hammer/)
- **Copyright status**: Copyrighted

## FAQs
### Q: Who created HAMMER?
A: HAMMER was created by Matthew Dillon, a systems software engineer, and developed by DragonFly BSD.

### Q: What is the license for HAMMER?
A: HAMMER is licensed under the 3-clause BSD License.

### Q: What operating system uses HAMMER?
A: HAMMER is used by DragonFly BSD.

### Q: What is the relationship between HAMMER and HAMMER2?
A: HAMMER2 is the successor to HAMMER, developed by DragonFly BSD.

### Q: What are the aliases for HAMMER?
A: HAMMER is also known as HAMMER.5, HAMMER(5), HAMMER.8, HAMMER(8), and HAMMER1.

## Why It Matters
HAMMER is significant as it represents a specialized file system designed for efficient storage and retrieval of files and directories. Developed by DragonFly BSD and Matthew Dillon, it plays a crucial role in the operating system's data management capabilities. The file system's development and subsequent evolution to HAMMER2 highlight ongoing advancements in file system technology. Its use of the 3-clause BSD License ensures that it remains accessible and modifiable for developers. HAMMER's importance lies in its contribution to the DragonFly BSD ecosystem, providing a robust solution for handling data storage needs.

## Notable For
- **Development by DragonFly BSD**: HAMMER was developed by DragonFly BSD, a BSD-based operating system.
- **Created by Matthew Dillon**: The file system was created by Matthew Dillon, a notable systems software engineer.
- **Successor to HAMMER2**: HAMMER2 is the successor to HAMMER, indicating continued development and improvement.
- **BSD License**: HAMMER is licensed under the 3-clause BSD License, ensuring its availability and modifiability.
- **Operating System Integration**: HAMMER is integrated into DragonFly BSD, providing efficient file system operations.

## Body
### Overview
HAMMER is a file system developed by DragonFly BSD and its creator, Matthew Dillon. It was first introduced in 2008 and is designed to efficiently store and retrieve files and directories on data storage devices. The file system is part of the DragonFly BSD operating system and is licensed under the 3-clause BSD License.

### Development and Evolution
HAMMER was developed by DragonFly BSD and Matthew Dillon, a systems software engineer. The file system's development began in 2008, with subsequent improvements leading to the creation of HAMMER2. This evolution reflects ongoing advancements in file system technology within the DragonFly BSD ecosystem.

### Technical Details
HAMMER is a concrete format for storing files and directories, providing efficient data management capabilities. It is integrated into DragonFly BSD and is licensed under the 3-clause BSD License. The file system's development and use of the BSD License ensure its accessibility and modifiability for developers.

### Significance
HAMMER plays a crucial role in the DragonFly BSD operating system, providing a robust solution for handling data storage needs. Its development and subsequent evolution to HAMMER2 highlight ongoing advancements in file system technology. The file system's use of the 3-clause BSD License ensures that it remains accessible and modifiable for developers.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "HAMMER",
  "description": "File system from DragonFly BSD developed by Matthew Dillon in 2008",
  "url": "http://www.dragonflybsd.org/hammer/",
  "sameAs": ["https://www.wikidata.org/wiki/Q15241312", "https://en.wikipedia.org/wiki/HAMMER_(file_system)"],
  "additionalType": "FileSystem"
}

## References

1. [HAMMER(5) — HAMMER file system](http://bxr.su/d/share/man/man5/hammer.5)
2. [Source](http://bxr.su/d/sys/vfs/hammer/)
3. [Source](http://bxr.su/d/sys/vfs/hammer/hammer.h)
4. Freebase Data Dumps. 2013