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The ext2 or second extended file system was the standard filesystem used on the Linux operating system for a number of years and remains in wide use. It was initially designed by Rémy Card based on concepts from the extended file system. Ext2's main drawback is that it is not a journaling filesystem. Ext3, Ext2's successor has a journal and is compatible with Ext2. Lots of benchmarks are written against it, as its very fast.