understanding /etc/fstab and root mounting

[garyj]

I notice there is no entry in /etc/fstab for the root filesystem on my arch install (GoFlex Home). If I wanted to turn on disk quota, which is usually done by adding usrquota and/or grpquota options to fstab, how would I do that? If I add an entry for the root filesystem, this seems to make it unbootable.

[hydro]

At least on my DockStar editing /etc/fstab does work.
My root partition has a label "root" as blkid /dev/sdc2 reveals
$this->bbcode_second_pass_code('', '
/dev/sdc2: LABEL="root" UUID=""3a00a73b-ed4d-495f-be88-3dbb42ac6f63 TYPE="ext4"
')
which I use in the /etc/fstab to pass options noatime and nodiratime. I also added usrquota to the home partition now
$this->bbcode_second_pass_code('', '
LABEL=root / ext4 defaults,noatime,nodiratime 0 0
LABEL=boot /boot ext2 defaults,noatime,nodiratime 0 0
LABEL=home /home ext4 defaults,noatime,nodiratime,usrquota 0 0
')
This obviously works, since mount reports
$this->bbcode_second_pass_code('', '
/dev/root on / type ext4 (rw,noatime,nodiratime,user_xattr,acl,barrier=1,data=ordered)
/dev/sdc1 on /boot type ext2 (rw,noatime,nodiratime)
/dev/sdc3 on /home type ext4 (rw,noatime,nodiratime,usrquota)
')
The Arch Boot Process is described here.