This is a snippet taken from the fstab man page. I believe it should answer your
question:
"The sixth field, (fs_passno), is used by the fsck(8) pro-
gram to determine the order in which filesystem checks are
done at reboot time. The root filesystem should be speci-
fied 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 pre-
sent or zero, a value of zero is returned and fsck will
assume that the filesystem does not need to be checked."
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