Windows Performance Monitor (PerfMon.exe) is a quick and easy way to monitor the performance of server hardware and the operating system to troubleshot problems and discover performance bottlenecks. PerfMon is flexible and has low overhead.

A link to an outstanding blog post authored by a Microsoft senior support engineer on using PerfMon to monitor disk performance can be found <a href="http://blogs.technet.com/b/askcore/archive/2012/03/16/windows-performance-monitor-disk-counters-explained.aspx">here</a>.