Problem with the Primary disk score in Windows Experience Index scoring to low

I am using the Windows 7 Windows Experience Indox (score 1.0 to 7.9) on some i7 desktops I built.  

The issue is the Primary Hard Disk subsore is 5.9 no matter what I do with my SATA hard drive.

I started with SATA 2 (3 Gbp/s) SATA Drives on a i7-920 Gigabtye desktop.  Ran the test and the score was 5.9 for Primary hard drive.  Then I replaced the primary hard drive with a Western Digital Caviar Black SATA 3 (6 Gbp/s) hard drive (the fastest SATA hard dirve and ran the Windows Experience test.  The score stayed at 5.9.

It seems this is not reporting correctly.  I can tell a huge speed increase since going from the Western Digital SATA 2 to the SATA 3 so I know it is much faster.

Anyone know why this is happening?  

I ran the 3rd party PassMark Performance test on the i7 desktop and the Disk Mark is 706 out
of 800 which is good.

I have done this same type test on two diff. i7 desktops (one an i7-950) with exact same type results.

Both dekstops have 8 GB of DDR3 RAM, plenty of hard disk space and clean installs etc..

Anyone know if the Win 7 perf. test for hard drives is broken in this way?

Thanks
rdwolfAsked:
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Hutch_77Connect With a Mentor Commented:
The windows experience is honestly not a good measuring stick.  I have seen serious rigs not even max it out and they have serious hardware.  to get a 7.9 in hardware you need PCIE solid state drives not sata disk drives.  But the Windows performance is not a good benchmark to try and meet as you saw in your other tests.

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nobusConnect With a Mentor Commented:
i found this :
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

Credits: http://www.sevenforums.com/general [...] index.html

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jamietonerConnect With a Mentor Commented:
I have a 180gb vortex 2 sata drive thatscores 7.6. But 5.9 is the highest I have seen a hdd get, my old raid 0 on 2 raptors only scored 5.9 and im fairly certain it was faster than your sata 3 drive. If you want to score higher you'll need ssds.
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rdwolfAuthor Commented:
Thanks for the info. based on your input and research it seems I would need to go to SSD's to get above 5.9.  What still does not make sense is why the WIndows score is 5.9 using SATA 2 (3 Gb/s) 7200 RPM drives and stays 5.9 with SATA3 (6Gb/s) 7200 RPM drives.  I would think the Windows score woutld be less for the SATA 2 over the SATA 3 7200 RPM drives. It would seem the WIndows Index is a bit limited in this area.
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