A new drive is normally 'blank/a clean slate' when you get it. It needs prepairing for use. IE formatting.
Fdisk is optional, but a good idea, i believe, to partition the drive into several bits. That way you can put your personal files on one partition, and put windows on the primary partition. (IE c:). Then if you ever need to re-install windows, all your presonal stuff is still there.
I found the instructions click here very helpful for me. There is a detailed set of instructions for fdisk and format. Hope this is the info you need.