How to disable USB storage device write (How to make usb storage device read only)

In most of our computers we store our personal or secret information. But due to introduction of USB devices it is very easy to copy any information from any ones computer. In a company environment any one can copy the secret files in the company with a small pen drive or something. And pen drives cause virus threat also. Increasing popularity of pen drives the problem in increased. In windows vista system there is a option to write protect the USB drives without using a software. By a simple registry trick we can easily make the USB storage device read only

To make USB storage device as read only

• Click Start button select run and then type regedit (To open registry editor)
• Navigate through HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
  
  
• Right Click on Control and select New and then Key. Name the Key as StorageDevicePolicies
• Right Click on StorageDevicePolicies and select new and then DWORD and name the dword as WriteProtect
• Right Click on WriteProtect and select Properties
• Set the value to 1 and click OK

The computer is now configured to disable writing to USB storage devices.