Hi Harish
Click your Start Button, then just type cmd, then right click Command Prompt in the resulting list and select 'Run as Administrator'
Run this command and hit Enter:
diskpart
Run this command and hit Enter:
list disk
(Make note of the disk number you want to wipe and enter it into the next command - replace X)
Run this command and hit Enter:
select disk X
Run this command and hit Enter:
clean
Then, close Command Prompt, and check in Disk Management if that drive is now marked as 'Unallocated Space' and if so, right click that space and select 'New - Simple Volume' and accept the defaults.