Editing DragonFly BSD (section)

=== HAMMER file systems ===
{{Main article|HAMMER (file system)|HAMMER2}}
Alongside the [[Unix File System]], which is typically the default [[file system]] on BSDs, DragonFly BSD supports the [[HAMMER (file system)|HAMMER]] and [[HAMMER2]] file systems. HAMMER2 is the default file system as of version 5.2.0.

HAMMER was developed specifically for DragonFly BSD to provide a feature-rich yet better designed analogue of the increasingly popular [[ZFS]].<ref name="unix-for-clusters" /><ref name="kt-interview" /><ref name="hammer-design-document" /> HAMMER supports configurable file system history, [[snapshot (computer storage)|snapshot]]s, [[checksum]]ming, [[data deduplication]] and other features typical for file systems of its kind.<ref name="towards-free-clustering" /><ref name="can-hammer-compete" />

HAMMER2, the successor of the HAMMER file system, is now considered stable, used by default, and the focus of further development. Plans for its development were initially shared in 2012.<ref name="hammer2-design" /> In 2017, Dillon announced that the next DragonFly BSD version (5.0.0) would include a usable, though still experimental, version of HAMMER2, and described features of the design.<ref name="hammer2-release" /> With the release after 5.0.0, version 5.2.0, HAMMER2 became the new default file system.