Red Hat :: Extra New Partition On Hard Disk To Mount VAR

On my embedded linux box, running on Linux Kernel 2.6.9 embedded with BusyBox utilities.

An Objective are follow:
1/ To figure out how many partitions are on the hard disk
2/ Create a extra partition about 10GB size on the hard disk
3/ Format the partition and mount var on that partition

Only utility to perform above operations I have "sfdisk" utility from BusyBox collection. Which get installed at the time of image flash in to ROM (8mb ROM size). The following is the root directory structure where hdd as a directory mounted /mnt/hdd1

Code:
~ > ls
bin etc lib proc sbin sys var
dev hdd mnt root share tmp var_init
Within /bin sfdisk utility can be used which I tried but no avail.

Code:
~ > sfdisk -l /dev/hda
/dev/hda: No such file or directory
sfdisk: cannot open /dev/hda for reading
~ > sfdisk -l /dev/sda0
/dev/sda0: No such file or directory .....