The DragonFly BSD operating system uses an advanced, copy-on-write filesystem called HAMMER2. The filesystem's copy-on-write feature means that changes written files on the disk are created in copies of the data, meaning updates to the disk are atomic and should not suffer from sudden interruption, like a power outage or system crash. This means filesystem checks usually are not needed, but a filesystem check (fsck) tool has been created anyway to verify the integrity of the filesystem's content. DragonFly BSD Digest has a post which reads: "HAMMER2 is copy on write, meaning changes are made to copies of existing data. This means operations are generally atomic and can survive a power outage, etc. (You should readupon it!) However, there's now a fsck command, useful if you want a report of data validity rather than any manual repair process."
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