This trick can be used to hide the disk drives in your Computer.
Go to start menu>select run the type regedit.
Now Got to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer.
Right click on the right pane and create a new Dword value.
Give the name as NoDrives Give the name as it is given here.
Modify it’s value and make it to 3FFFFFF(Hexadecimal).
Now restart your PC.
Open my computer you will not see any disk drives now!!!.
To get them back just delete this dword value and restart your PC.You will get back the drives now!!!.