# btrfs check --repair /dev/sdb2 enabling repair mode WARNING: Do not use --repair unless you are advised to do so by a developer or an experienced user, and then only after having accepted that no fsck can successfully repair all types of filesystem corruption. Eg. some software or hardware bugs can fatally damage a volume. The operation will start in 10 seconds. Use Ctrl-C to stop it. 10 9 8 7 6 5 4 3 2 1 Starting repair. Opening filesystem to check... ERROR: /dev/sdb2 is currently mounted, use --force if you really intend to check the filesystem # << マウントしてない状態でやるのか
