Add a new harddisk to linux

1.fdisk /dev/sdbxxx follow instructions,fdisk entire disk.
2.mkfs -t ext3 /dev/sdbxxx
3.mkdir -p /opt;mount /dev/sdb1 /mnt -o rw
4.Add item to /etc/fstab file.such as : /dev/sdb1 /opt ext3 defaults 1 1