Winsat will not give you fancy graphs but it will give a Windows rating and a time to complete specific tests. This can be a way of measuring your drives between tweaks.

At a command prompt run the following tweak as an administrator:

winsat disk -drive c                 (you can substitute c with the drive letter of your choice)

• Roadkil.net’s Disk Speed
• CheckDiskGUI
• Parkdale
• ATTO - “The industry’s leading provider of high-performance storage connectivity products” has great products and an excellent benchmarking utility that measures your hard drive’s I/O read/write ability.