Disk Bench 2.5.3.2 is a Disk Management product from nodesoft.com, get 5 Stars SoftSea Rating, Disk Bench tests your hard drive speed in a real life situation not in a benchmarking environment. All it does is copies a file from A to B, times the time it took, and deletes the file from B again. Optionally, you can also run a benchmark by creating a file with a user-specified size.
The software is using the current filesystem to save a file. If it is fragmented, the performance will be degraded, as it is in real life.

So, to figure out how fast your computer is, you can copy a file from A to B and use a stop watch.

Or you could just as easy use this program.

All it does is:
1) copies a file from A to B, times the time it took, and deletes the file from B again.
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2) The other way to benchmark is to choose Create File. This way it just creates a file (consisting of a repeated 128 byte string). So if you only have one harddisk, this is the optimal test for you. The license of this file & disk software is Freeware, you can free download and free use this File & Disk software.