Hierarchical File System

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Developer(s) Apple Computer

Full name Hierarchical File System

Introduced September 17, 1985; 35 years ago with System 2.1

Partition identifier Apple_HFS (Apple Partition Map)
0xAF (MBR) HFS and HFS+

Directory contents B-tree

File allocation Bitmap

Bad blocks B-tree

Max. volume size 2 TB (2 × 10244 bytes)

Max. file size 2 GB (2 × 10243 bytes)

Max. number of files 65535

Max. filename length 31 characters

Allowed characters in filenames All 8-bit values except colon ":". Discouraged null and nonprints.

Dates recorded Creation, modification, backup

Date range January 1, 1904 - February 6, 2040

Date resolution 1s

Forks Only 2 (data and resource)

Attributes Color (3 bits, all other flags 1 bit), locked, custom icon, bundle, invisible, alias, system, stationery, inited, no INIT resources, shared, desktop

File system permissions AppleShare

Transparent compression Yes (third-party), Stacker

Transparent encryption No

Supported operating systems Classic Mac OS, macOS, Linux, Microsoft Windows (through MacDrive or Boot Camp IFS drivers)

Additional information

Hierarchical File System

Apple file system for macOS

Hierarchical File System may refer to

Hierarchical file system, a file system that is organized hierarchically with a tree structure
Hierarchical File System (Apple), a file system by Apple used for the classic Mac OS operating system
Hierarchical File System (IBM MVS), a file system by IBM used for the MVS/ESA, OS/390 and z/OS operating systems

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See also