((If the system crashes (due to power outage etc...) then upon boot the system will check if the disk was unmounted cleanly. If not you may get the following message:
Unexpected inconsistency; Run fsck Manually
...
*** An error occurred during the file system check.
*** Dropping you to a shell; the system will reboot
Give root password for maintenance
(or type Control-D for normal startup):
At this point enter the root password then run fsck:
(repair file system) 1# fsck -A -y
***** FILE SYSTEM WAS MODIFIED *****
(repair file system) 2# exit ))