The ext4 [ fourth extended filesystem ] is a journaled file system developed as the successor to ext3. Ext4 file system was released released on December 25, 2008 as a part of Kernel 2.6.28. at present Fedora, which is expected to arrive in late May, will use Ext4 as its standard file system. Ext4 will also be available optionally in Ubuntu 9.04, Red Hat 5.3, Mandriva 2009.1 and others.The ext4 filesystem can support volumes with sizes up to 1 exabyte ( 1 exabyte = 1,048,576 terabytes ) and files with …