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a journaling file system for Linux, and successor to ext3

What is ext4?

ext4 is a journaling file system. Being the forth generation of the Extended Filesystem (full name: Fourth extended file system), it is the successor to ext3, to which it is backward compatible. Its first stable release was introduced in October 2008.

On a 4k block filesystem, it features a maximum file size of 16 TiB, a maximum volume size of 1 EiB, and can hold up to 4 billion files on a single volume. Next to the size improvements, it also brings speed improvements over .

Related tags

  • : the second generation of the "extended file system"
  • : the third generation of the "extended file system"
  • : the forth generation of the "extended file system"
  • : A file system is the logical structure to organize (store, retrieve and update) data on a storage device.
  • : The command to make a storage device accessible
  • : a filesystem used on MS Windows systems