One of the oldest file systems supported by Linux. 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 R my Card based on concepts from the extended file system. It is quite fast, enough so that it is used as the standard against which to measure many benchmarks. Its main drawback is that it is not a journaling file system. Its successor, ext3, has a journal and is compatible with ext2.