Press the Windows key+X and choose Powershell (Admin) or Command Prompt (Admin)
Here type Diskpart and press Enter. type the following Bold commands pressing Enter after Each one.
(ie) DISKPART >
ii) list disk
(ie) DISKPART > list disk
It now lists disk by number
you have to select the disk next with
iii) select disk <disk number>
(ie) DISKPART> Select Disk (disk number) = as listed in previous command. The selected disk now has an Asterisk next to it.
iv) clean (this erases all data on the Disk, so be sure you choose the correct one)
(ie) DISKPART> clean
v) convert gpt
vi) create partition primary
vii) format fs=ntfs quick
now for verification of disk status and free space type
v) list disk
the status should be "online" and free space should be "disk size"
‘vi)exit