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(EXTended file system) The first file system developed exclusively for the Linux operating system. Introduced in 1992, the limits of the Minix file system originally used in Linux were greatly increased: volume size from 64MB to 2GB, and file names from 14 to 255 characters. Ext also introduced a virtual file system (VFS) interface, which allows different underlying architectures to be used.

ext2, ext3, ext4
In 1993, ext2 added the traditional Unix inode and other features of the Unix File System (see inode and UFS). Maximum volume size jumped to 32TB.

Introduced in 2001, the major enhancement to ext3 was three levels of journaling, the most robust of which duplicates the indexes and file contents in the journal before updating the actual file system (see journaling file system). See file system.

In 2008, ext4 added several enhancements for large files: maximum volume size increased to one exabyte and file size to 16TB.
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On drawings, abbr. for “exterior.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
[6.] Fairbanks K.: A Technique for Measuring Data Persistence using the Ext4 File System Journal, IEEE 39th Annual International Computers, Software & Applications Conference (2015).
Figures 4(a) and 4(b) show I/O bandwidth of ReHypar combined with ext4, while comparing it to ext4 installed on SSD.
Easy to use: Mount any Ext2, Ext3, Ext4 drives like it is part of the native Windows file system
The custom ROM includes a new enhanced UI (user interface) and EXT4 based file system that can effectively improve the speed and performance of the phone.
<p>The ext4 file system, which updates the default Linux file system, also was cited.
Other new features of the V3 firmware include EXT4 support for very large volumes and file sizes, SNMP support, and bitmap support for faster rebuilding of RAID volume after a crash or adding/removing a drive.
Then, we converted the Android sparse image format to ext4 format to mount the image.
EXT Family features and limitation Linux File Year of Features System Introduction EXT 1992 Virtual File system concept used EXT2 1993 File Compression added EXT3 1999 Journaling added, online file system growth EXT4 2006 Extent-based storage, backward compatibility with EXT2 and EXT3,Online defragmentation Linux File Limitation System EXT No support for separate timestamp for file access EXT2 No journaling feature EXT3 Lack feature such as extents, dynamic allocation of inodes and block suballocation EXT4 Do not overwrite the file after deletion causing security problem Table 2.
Unlike basic file systems such as ext4 and TexFAT, Reliance Nitro is capable of monitoring both user data and metadata to detect inconsistencies and provide early warning of imminent flash failure and/or data corruption.
By default Fedora creates separate /boot, root and /home ext4 partitions and uses LVM (Logical Volume Management) which will make for a more extensible hard disk configuration.
The test was conducted on seven Samsung smartphones with rooted Android capability and emphasis on YAFFS2 and Ext4 files.