Btrfs (B-tree FS, uitgesproken als Better FS({{Citeer web | people = Valerie Henson | title = Chunkfs: Fast file system check and repair | url = http://mirror.linux.org.au/pub/linux.conf.au/2008/Thu/mel8-262.ogg | time = 18m 49s }})({{Citeer web|url=http://lwn.net/Articles/267896/ | title=CRFS and POHMELFS | publisher=Lwn.net}})) is een copy-on-wr...