Filesystem mount options There are many mount options, some security related. nosuid - Do not allow any setXid programs to be run on this filesystem. noexec - Do not allow any programs at all to be run on this filesystem. nodev - Don't honor device files on this filesystem ro - mount filesystem read-only rw - mount filesystem read/write encryption - for mounting encrypted filesystems noatime - Don't update atime on files noauto - do not mount this filesystem when 'mount -a' called sync - Use synchronous I/O mand - Mandatory locking (more later) user - allow a non-root user to mount/unmount the filesystem. (implies noexec,nosuid,nodev) users - same as user, but any user can umount.