Block copy data from computer to flash or usbdisk

How to secure your computer (Windows XP) so that data can not be copied to do the flash as following

1. open regedit

2. HKEY_LOCALMACHINE \ SYSTEM \ CurrentControlSet \ Control

3. CONTROL in the folder, type -> Edit> New> Key the new folder name -> "StorageDevicePolicies"

4. "StorageDevicePolicies", type Edit> New> Dword (32-bit)

5. key is a new name: "WriteProtect"

6. Click 2x Key WriteProtect it, and so change the Value Data 1

7. Restart

To open a data protection that can be copied to the flash with the value in the key write protect to 1.