You can get a much better description from
man 5 fstab
and
man 8 mount
;)
However:
rw : Mount read/write
noatime : Do not update inode access times on this file system (e.g, for faster access on the news spool to speed up news servers).
1 1 : 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 determine 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.
So this mount point will be dumped if there is a problem and will be checked for consistency on startup.
