It might raise it a little, but why does it matter. The WEI isn't a good representation of your system anyhow. For a single hard drive (non raid) the highest score is 5.9. If this worries you, don't worry, all single hard drives are 5.9 or less.
Your WEI score is the lowest number out of the catagories. If your memory, cpu, and video scores look normal, don't worry about the hard drive or overall score.
You can change the log file for WEI and cheat your way to 7.9 for all category. In reality, WEI means very little on how well your computer perform and this is also true for a range of artificial benchmark. As long as the disk perform as you expected and get you job done, you have nothing to worry about.