-bash-3.2# fsck_hfs /dev/disk0s2
** /dev/rdisk0s2
   Executing fsck_hfs (version diskdev_cmds-540.1~34).
** Checking Journaled HFS Plus volume.
   The volume name is Macintosh HD
** Checking extents overflow file.
** Checking catalog file.
** Checking multi-linked files.
** Checking catalog hierarchy.
** Checking extended attributes file.
   Invalid node structure
(8, 16463)
** The volume Macintosh HD could not be verified completely.