Open Command Prompt on server and type the following:

 
DISKPART

DISKPART> list disk 

You will see a list of all hard drives detected on the system. Figure out which disk you want to work with, and make note of the Disk Number in the first column.

DISKPART> select disk 1
(Disk 1 is now the selected disk.)
DISKPART> create partition primary
DISKPART> list partition
DISKPART> select partition 1
DISKPART> format fs=NTFS quick
DISKPART> assign letter=D