ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3. It is the default file system for many Linux distributions, including Ubuntu, Fedora, and Red Hat Enterprise Linux.

ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. However, other Linux kernel developers opposed accepting extensions to ext3 for stability reasons, and proposed to fork the source code of ext3, rename it as ext4, and perform all the development there, without affecting existing ext3 users.

Ext4 offers a number of advantages over ext3, including:

  1. Increased performance: Ext4 is faster than ext3, especially for large files and databases.
  2. Increased reliability: Ext4 is more reliable than ext3, and it is less likely to become corrupted in the event of a crash.
  3. Increased capacity: Ext4 can support larger files and partitions than ext3.
  4. Increased features: Ext4 supports a number of new features, such as file compression and extended metadata.

Ext4 is a mature and stable file system, and it is the default file system for many Linux distributions. It is a good choice for storing data on Linux computers.

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