Ext3

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The ext3 filesystem, or third extended filesystem, is an extent of the ext2 filesystem that preceded it. It is a journaled filesystem, and is commonly used in Linux distributions, such as Debian and its variants. It was superseded by ext4. Lead developer Stephen Tweedie announced that he was making changes to the ext2 filesystem in 1998, and again in a Linux mailing list in Febuary 1999. The filesystem became part of the Linux kernel in November 2001, and has stayed so from 2.4.15 onwards. The major improvement over ext2 is its journaling capabilities, which allow it to be much more stable, and removes the need to check a filesystem for errors after an unclean shutdown.