Those who are having very low score for HDD in Windows 7, follow this method to get higher score.

To increase your Windows 7 Beta HDD WEI score (in many systems):

1. Control panel>hardware & sound>device manager
2. Under disk drives, find your main drive
3. Right click your main drive and select properties
4. Policies tab, uncheck the "enable write caching on this device"
5. Click ok, and re-run your WEI

Dun forget to check back "the enable write caching on this device"