I have posted similar tutorial HIDE ENTIRE DRIVE. But the tutorial I am gonna post today is the easiest and ost secure of all. Hide entire drive in few step n CMD window.
So here we go:-

• Open the CMD window. Go to Start-->Run--> Type cmd-->enter.
• Now type list volume. Note the volume that you wanna hide.

• Suppose in my case it is D having volume 3.

• Now select the desired volume.

• Now type remove letter D for hiding D in our case.

• Exit CMD and your drive is invisible.
• You make a search everything possible you won't find it until unless you unhidden it.

• For that go through same steps and write assign letter D in place of remove letter D.

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