Add new partition:
In fdisk, use “t” command to choose system id (partition type: Linux, SWAP or others).
If you can see the new partition in the list of fdisk -l, then use mkfs to create file system. The Linux default file system is ext3.
mkfs ext3 /dev/hdb1
If all steps are okay above, then edit /etc/fstab to mount you file system.
Personally suggest `cfdisk' 😛