1. From the Start Menu, Click Run..
Volume x is the selected volume
DISKPART>
Open 'My Computer' and observe. Drive Y: will no longer be visible and you won't be able to access any data on it and nor will anyone else. It is a useful way of hiding secret data.
2. In the 'Run..' dialog box, type 'diskpart'.
3. Click 'OK'. A Command Prompt window will open named Microsoft DiskPart version 1.x.xxxx
4. 'DISKPART>' will be displayed in the command window. Now type 'list volume'. It will list all the volumes
5. After DISKPART>, select the volume number of the drive whose letter you want to hide. Your program should look like this:-
DISKPART> select volume x Where, 'x' is the number of the volume you want to hide.
6. Hit enter. A message displays:-
DISKPART> select volume xVolume x is the selected volume
DISKPART>
6. In the next Command Line, type 'remove letter y' if Y: is your drive-letter. Hit enter. You get a message saying that Letter y has been removed.
DISKPART> select volume x
Volume x is the selected volume
DISKPART> remove letter y [Hit enter]
Letter y removed.
DISKPART>

Open 'My Computer' and observe. Drive Y: will no longer be visible and you won't be able to access any data on it and nor will anyone else. It is a useful way of hiding secret data.
7. Now to view the drive type 'DISKPART> assign letter y
Hide Data,
Windows XP
10:48 AM
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