I just added a 120 Gb drive as /dev/hdb. When I do mount /dev/hdb1 /backup the drive is visable. I went to add to fstab and found I had to make the "LABEL=" blank for it to automount at boot. Below is the detail of how I added the drive and the commands that I used to get to where I am now.

fdisk /dev/hdb

option "n" to add a partition. Took defaults to use whole drive
option "w" to write and then "q" to quit

mkfs -t /ext3 /dev/hdb1

mkdir /backups

mount /dev/hdb1 /backups
df -k shows /backups and 115 Gb size 1% used

************************************************************
/etc/fstab after edited
************************************************************

LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
LABEL= /backups ext3 defaults 1 2
LABEL=/db2dat /db2dat ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hda5 swap swap defaults 0 0
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,r
o 0 0
/dev/cdrom1 /mnt/cdrom1 udf,iso9660 noauto,owner,kudzu,r
o 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0
************************************************************
Comments:

The /, /boot, /db2dat all show a label. I had to add LABEL= blank for the ne partion to mount at boot
The others were make when Linux was install using Disk Druid

Did I miss a step?
What do I need to do change the blank label to /backups

After I posted I noticed the tabs were gone in the /etc/fstab I supplied so it is difficult to read



LABEL=/ / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
LABEL= /backups ext3 defaults 1 2 <--------- This is the blank label line
LABEL=/db2dat /db2dat ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/hda5 swap swap defaults 0 0
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,r
o 0 0
/dev/cdrom1 /mnt/cdrom1 udf,iso9660 noauto,owner,kudzu,r
o 0 0
/dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0

You need to add a volume label. You can add a label to this partition or instead use the device ID i.e.

/dev/hdb1 /backups ext3 defaults 1 2

To add label:
http://www.netadmintools.com/html/tune2fs.man.html
http://www.die.net/doc/linux/man/man8/e2label.8.html