no man fstab

Código :
The  fourth  field, (fs_mntops), describes the mount options associated
       with the filesystem.
       It is formatted as a comma separated list of options.  It  contains  at
       least  the type of mount plus any additional options appropriate to the
       filesystem type.  For documentation on the available options  for  non-
       nfs  file systems, see mount(8).  For documentation on all nfs-specific
       options have a look at nfs(5).  Common for all types of file system are
       the options ‘‘noauto’’ (do not mount when "mount -a" is given, e.g., at
       boot time), ‘‘user’’ (allow a user to mount), ‘‘owner’’  (allow  device
       owner to mount), ‘‘pamconsole’’ (allow a user at the console to mount),
       and ‘‘comment’’ (e.g., for use  by  fstab-maintaining  programs).   The
       ‘‘owner’’,  ‘‘pamconsole’’  and ‘‘comment’’ options are Linux-specific.
       For more details, see mount(8).
    The fifth field, (fs_freq),  is  used  for  these  filesystems  by  the
       dump(8)  command  to determine which filesystems need to be dumped.  If
       the fifth field is not present, a value of zero is  returned  and  dump
       will assume that the filesystem does not need to be dumped.
       The  sixth field, (fs_passno), is used by the fsck(8) program to deter-
       mine the order in which filesystem checks are done at reboot time.  The
       root  filesystem  should  be specified with a fs_passno of 1, and other
       filesystems should have a fs_passno of 2.  Filesystems within  a  drive
       will  be checked sequentially, but filesystems on different drives will
       be checked at the same time to utilize  parallelism  available  in  the
       hardware.   If  the sixth field is not present or zero, a value of zero
       is returned and fsck will assume that the filesystem does not  need  to
       be checked.

:roll: nao entendi mto bem .. se alguem souber explicar