![](http://www.lifehacker.com/images/2006/04/disable-usb-drives.png)
A common security concern at organizations is allowing users to plug in a usb flash drive, because they could so easily copy corporate data.
Since Windows XP SP2, you can disable writing to USB devices altogether using a simple registry hack.
Here it is:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies]
“WriteProtect”=dword:00000001