Hello AskPerf folks!  This is just a quick blog post to inform you of a great posting from one of our Disk Experts on our Core team.  It is very informative and talks about measuring Physical Disk IO Latency with Perfmon.  Check it out!

Measuring Disk Latency with Windows Performance Monitor (Perfmon)

http://blogs.technet.com/b/askcore/archive/2012/02/07/measuring-disk-latency-with-windows-performance-monitor-perfmon.aspx

-Blake Morrison