fsck Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the command is run. Check filesystem /dev/sda, reporting any damaged blocks: fsck {{/dev/sda}} Check filesystem /dev/sda, reporting any damaged blocks and interactively letting the user choose to repair each one: fsck -r {{/dev/sda}} Check filesystem /dev/sda, reporting any damaged blocks and automatically repairing them: fsck -a {{/dev/sda}}