How can I stop users searching network drives?

We have a number of mapped network drives and one of them is l linux mapped drive. When users search they tend to search all drives. When the Linux drive is searched it slows the linux server down for all users. How can I prevent them from searching a drive letter?

I found this but is only for windows desktop search 4, does anyone know of an ADM template configured for this that I can import in to active directory?

 http://technet.microsoft.com/en-us/library/cc753315(WS.10).aspx#BKMK_Preventindexingcertainpaths