Section: Maintenance Commands (8)Local indexUp BSD mandoc
Mac OS X
- HFS file system consistency check
special ... fsck.hfs
special ... fsck.hfs
[-n | y | r
utility verifies and repairs standard HFS and HFS+ file systems.
The first form of
quickly checks the specified file systems to determine whether
they were cleanly unmounted.
The second form of
preens the specified file systems.
It is normally started by
during systen boot, when a HFS file system is detected.
When preening file systems,
will fix common inconsistencies for file systems that were not
If more serious problems are found,
does not try to fix them, indicates that it was not
successful, and exits.
The third form of
checks the specified file systems and tries to repair all
If no options are specified
will always check and attempt to fix the specified file systems.
The options are as follows:
of the cache used by
can result in better performance but can result in deadlock when
option. Size can be specified as a decimal, octal, or
hexadecimal number. If the number ends with a ``k'', ``m'',
or ``g'', the number is multiplied by 1024 (1K), 1048576 (1M),
or 1073741824 (1G), respectively.
Display debugging information.
This option may provide useful information when
cannot repair a damaged file system.
When used with the
to check `clean' file systems, otherwise it means force
to check and repair journaled HFS+ file systems.
to generate its output strings in GUI format.
This option is used when another application with a graphical user interface
(like Mac OS X Disk Utility) is invoking the
Lock down the file system and perform a test-only check.
This makes it possible to check a file system that is currently mounted,
although no repairs can be made.
Mode is an octal number that will be used to set the permissions for the
lost+found directory when it is created.
The lost+found directory is only created when a volume is repaired and orphaned
files or directories are detected.
places orphaned files and directories into the lost+found directory (located
at the root of the volume).
The default mode is 01777.
Preen the specified file systems.
to quickly check whether the volume was unmounted cleanly.
If the volume was unmounted cleanly, then the exit status is 0.
If the volume was not unmounted cleanly, then the exit status will be non-zero.
In either case, a message is printed to standard output describing whether the
volume was clean or dirty.
Always attempt to repair any damage that is found.
Never attempt to repair any damage that is found.
Rebuild the catalog file on the specified file system.
This option currently will only work if there is enough contiguous space on the
specified file system for a new catalog file and if there is no damage
to the leaf nodes in the existing catalog file.