Ext4

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Filesystems
Virtual Filesystems
VFS
Disk Filesystems
FAT 12/16/32, VFAT, ExFAT Ext 2/3/4 LEAN HPFS NTFS HFS HFS+ MFS ReiserFS FFS (Amiga) FFS (BSD)/UFS BeFS BFS XFS SFS ZDSFS ZFS USTAR
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ISO 9660 Joliet UDF
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Flash Filesystems
JFFS2 YAFFS

The ext4, or Fourth extended filesystem, is a filesystem created to serve as a successor to ext3. It is a journaling filesystem. It was originally created as a series of extensions to ext3, but was instead given its own branch of ext3 when other Linux kernel developers opposed extensions to ext3. While the development of these extensions had started in 2003, the ext3 maintainer announced the ext4 development plans in 28 June 2006. The in-development version of ext4 was merged into the Linux kernel at version 2.6.19, but it wasn't until 11 October 2008 that the stable version of ext4 was finally merged into the Linux kernel repositories.

Improvements

Large Filesystem Size

The ext4 filesystem can handle files up to 16 Tebibytes, and a filesystem up to the size of 1 Exbibyte.

Backwards Compatible

The filesystem is backwards compatible with both ext3 and ext2 filesystems.