UFS
UFS stands for UNIX file system, which was originally developed from the first versions of UNIX at AT&T. The file system reached its current status in the 4.x BSD distributions. It it currently used in FreeBSD, NetBSD as well as OpenBSD and the Solaris Operating Environment. In Mac OS X it is available as an alternative to HFS. Linux support is also available, but is not standard.FreeBSD versions 5.0 introduced UFS2, which in addition to soft updates and extended attribute support, allows a more efficient method of writing file system meta data, as well as support for volumes over 1TB in size. It has since been ported to NetBSD.
As of Solaris 7, Sun Microsystems included UFS Logging in the Solaris Operating Environment, which brought filesystem journaling to UFS.