readonly all usb drives

   1. Launch    regedit

   2. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control

   3. You should see a key called StorageDevicePolicies. If it doesn't exist, create a new key with that name.

   4. In the StorageDevicePolicy key, create a REG_DWORD value called  WriteProtect.

   5. Set the data value of WriteProtect to 1.

   6. This value will make USB storage read only. To enable read/write over USB, set the value to 0.

   7. Exit the editor.