Best way to stress test HDD's Pre-OS

I've got a T320 with a H710 card.  I want to stress test the drives before I install my OS.  Is there a good tool to do that?  If not, what can I use with Server 2008 R2 that would test my drives?

If there is no way to test pre-os, what utility should I use after I install Windows Server 2008 R2?

Thanks,

Roveer