make note of the partition number, execute the following as root.
# mke2fs /dev/hda[partition_number]
# mkdir /mnt/hd_name
# mount /dev/hda[partition_number] /mnt/hd_name
add to fstab if u want.
There is a way to add to one of your home or other partitions if u desire which is adjacent to this partition, backup the data to somewhere and then umount /home (for example) and delete ur existing /home and make a new partition in fdisk and do the above ^^^ and update the filesystem information in fstab. (/etc/fstab)