# Hierarchical File System

> Apple file system for macOS

**Wikidata**: [Q1058465](https://www.wikidata.org/wiki/Q1058465)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hierarchical_File_System_(Apple))  
**Source**: https://4ort.xyz/entity/hierarchical-file-system

## Summary
Hierarchical File System (HFS) is a file system developed by Apple Inc. for use in macOS and Classic Mac OS. It was introduced in 1985 as a replacement for the earlier Macintosh File System and was later succeeded by HFS Plus in 2001.

## Key Facts
- Developed by Apple Inc., founded on April 1, 1976
- Inception date: September 17, 1985
- Replaced Macintosh File System
- Followed by HFS Plus (also known as Mac OS Extended)
- Instance of: file system
- File extension: .hfs
- Operating system: Classic Mac OS
- Aliases: HFS, Mac OS Standard, Sistema de Arquivos Hierárquico, 계층 파일 시스템
- Wikipedia title: Hierarchical File System (Apple)
- Wikidata description: Apple file system for macOS

## FAQs
### Q: What is Hierarchical File System (HFS)?
A: Hierarchical File System is a file system developed by Apple Inc. for macOS and Classic Mac OS, introduced in 1985 to replace the earlier Macintosh File System.

### Q: What replaced HFS?
A: HFS was replaced by HFS Plus (also known as Mac OS Extended) in 2001, which offered improved performance and support for larger volumes.

### Q: What operating systems use HFS?
A: HFS was primarily used in Classic Mac OS and early versions of macOS before being replaced by HFS Plus.

## Why It Matters
Hierarchical File System was a critical development in Apple's computing history, providing the foundational file management structure for Macintosh computers. It introduced a more sophisticated way of organizing files and directories compared to its predecessor, enabling better data organization and management on Apple systems. HFS played a crucial role in the evolution of Apple's operating systems, serving as the standard file system for over a decade and helping establish the Mac platform's reputation for user-friendly file management. Its development represented Apple's commitment to creating integrated hardware-software solutions tailored to their specific needs.

## Notable For
- First file system specifically designed for Macintosh computers
- Introduced hierarchical directory structure to Apple's operating systems
- Served as the standard file system for Classic Mac OS for over 15 years
- Pioneered Apple's approach to proprietary file system development
- Laid groundwork for subsequent Apple file systems including HFS Plus

## Body
### Development and History
HFS was developed by Apple Inc. as part of their effort to create a more robust and scalable file system for Macintosh computers. The system was officially introduced on September 17, 1985, marking a significant advancement from the original Macintosh File System.

### Technical Specifications
As a file system, HFS provided the fundamental structure for storing and organizing files on Apple's storage devices. It used a hierarchical directory structure, allowing users to organize files in nested folders. The system supported the .hfs file extension and was specifically designed to work with Apple's hardware and software ecosystem.

### Relationship to Other Apple Systems
HFS was part of Apple's broader strategy of developing proprietary technologies for their platforms. It was succeeded by HFS Plus (HFS+), which offered improved performance and support for larger storage volumes. The development of HFS and its successors reflects Apple's ongoing commitment to optimizing file systems for their specific hardware and software requirements.

### Documentation and Resources
The file system is documented in various Apple developer resources and has been the subject of technical analysis in publications like MacJournals. Its structure and implementation have been studied and documented in technical literature, contributing to the broader understanding of file system design and implementation.

## References

1. [Source](http://macjournals.com/~mwj/mwj_samples/MWJ_20030525.pdf)
2. Freebase Data Dumps. 2013