You can hide your drive that is important by just few command lines. To do this follow few instructions
1. Go to Start Button.
2.Write cmd.
3.When command prompt appear right click on it and open it as administrator,
4.Write there 'diskpart',
5.When diskpart come write 'list volume'
6.You will see list of drives on your computer. For my computer I have three disks.
7.Now for example you want to remove volume 3 from your hard drive. Then write 'select volume 3'
8.You will be confirmed that volume 3 is selected. Then write 'remove letter d' ( Note: for my case volume 3 is d drive).

9.Then you will see that d drive of your computer is removed. Nobody will find it. Even nobody can search any file from this drive.
If you want to restore that drive again just do procedure 1 to 7. Then write 'assign letter d'