Unix File System

The Unix file system (UFS) is a family of file systems supported by many Unix and Unix-like operating systems. It is a distant descendant of the original filesystem used by Version 7 Unix.

This article is about the file system implementation in some Unix and BSD operating systems. For general Unix file system principles, see Unix filesystem.
Not to be confused with Universal Flash Storage, a storage device standard with the same abbreviation.
UFS
Developer(s)CSRG
Full nameUNIX file system
Introducedwith 4.2BSD
Structures
Directory contentstables
Limits
Max volume size273 bytes (8 ZiB)
Max file size273 bytes (8 ZiB)
Max filename length255 bytes
Features
Dates recordedUFS1 and UFS2: last access time (atime), last modified time (mtime), last inode change time (ctime), UFS2: inode creation time (birthtime)
Date rangeUFS1: December 14, 1901–January 18, 2038, UFS2: 64-bit signed integer offset from epoch
Date resolutionUFS1 and UFS2: Nanosecond
Other
Supported
operating systems		A/UX, DragonFly BSD, FreeBSD, FreeNAS, NAS4Free, HP-UX, NetBSD, NeXTSTEP, Linux, OpenBSD, illumos, Solaris, SunOS, Tru64 UNIX, UNIX System V, Orbis OS, and others
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