How to unhidden local disk drive using command prompt

How to know unhide a hidden drive using CMD 

In above the picture my local disk drive "D" is hidden

Frist click start and type cmd in the search box on the cmd right click it and select "RUN AS ADMINISTRATOR"

In a cmd window type DISKPART

Inside DISKPART> type "LIST VOLUME" and press enter

It show all drive and it's letters in your computer and also shows the volume numbers In volume 2 drive letter is missing so type "SELECT VOLUME 2" and press enter 

Volume 2 is selected

Next type "ASSIGN LETTER D" and press enter you can give any letter to your drive except listed letters

Your's hidden drive was showed up my D drive was unhidden