HD_Speed is a portable free utility tool that measures out the data transfer rate of your hard drives, CD/DVDRoms, external storage like USB key, flash cards, and even floppies, with a real-time graphic display.
Simply download the file and extract the portable executable file onto a convenient place on your local computer. And double click to launch it. Select the drive attached in the computer, and ready to go.
You’ve also got a few options to change for benchmarking. You can select Read or Write mode, and the block size to test. You can also log the results to the files in real time.
There are many tools out there that can do the same thing but this HD_Speed seems to be deadly simple to use and easy to understand.