Measure Actual Hard Disk Perfomance Under Windows http://www.raymond.cc/blog/archives/2008/02/28/... Did you know that your actual hard disk performance under Windows is determined not only by the speed of your harddrive (as measured by most disk benchmarks) but also by factors such as the mainboard chipset, UDMA/PIO mode, RAID configuration, CPU speed, RAM size and the quality of drivers? Here's how to measure actual hard disk performance.