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Extent File System
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<p>Extent File System (EFS) is an older extent-based <a href="/facts/File_system/FdPm90uc">file system</a> used in <a href="/facts/IRIX/vK9rSatM">IRIX</a> releases prior to version 5.3. It has been superseded by <a href="/facts/XFS/2I4Wn5wG">XFS</a>. </p>