DISABLE PEN DRIVE

Want to hide pen drive from your friends when they use it on your pc.
Now it is possible-When your friends inserts the pen drive on ur computer,it is not detected.
Curious to know how ??Following are the steps to disable the pen drive from the computer:

 1.Click Start, and then click Run or press Win+R.
2. A box will appear.
3.In the box, type regedit
4. Click OK. 
3. Locate, and then click the following registry key: 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor 
4. In the right pane, double-click Start. 
5. In the Value data box, type 4, click Hexadecimal (if it is not already selected), and then click OK. 
6. Quit Registry Editor.