In case you forgot to add another disk or partitioned your Linux installation wrong, you can still move /home to your new drive with these steps.  This works for Fedora, CentOS or SuSE.

Make sure that you are logged in as root and that no other user is logged in, then follow these steps;

1) fdisk /dev/sdb -- create a partition
2) mkfs.ext3 /dev/sdb1 -- format the partition as ext3
3) e2label /dev/sdb1 somelabel -- set a label 'somelabel' to the partition.
4) echo "LABEL=somelabel /home ext3 defaults,noatime 1 2" >>/etc/fstab -- auto mount at bootup
5) mount /dev/sdb1 /mnt -- mount somewhere now
6) cp -pPrfv /home/* /mnt/ -- copy everything over preserving everything
7) umount /mnt -- unmount it

// keep the old data in the original location for now
8) mkdir /oldhome
9) mv /home/* /oldhome/

10) mount -a

Now check to see if everything works. If it does (it should), then do the next step:
11) rm -rf /oldhome