Disable you USB Drive / Pen Drive in any computer running Windows

Hello,
There is one way in which you can disable your computer from reading usb drives or pendrives in your System.
For Windows 8 , Windows 7 / XP / Vista

1. Start => run 
2. Type regedit 
3.  In the window HKEY_LOCAL_MACHINE -> SYSTEM -> Current Control Set -> Services -> USBSTOR
4. Now there will be a option " start " in right side click and open it
5. Change the value from 3 to 4 ( Hexadecimal ) 
6. You are done. 

Now your system will not detect pendrive.

You can also enable it by repeating the step and changing start value again to 3 (Hexadecimal)
Note- The thing behind doing this is much more complicated and you will kknow this when you will study machine launguage and the how operating sysytems work.