Missing SATA SMART values?

[Omnigamer]

I debated whether to post this here or in the mobo section, but I figured it would probably be better answered here.

For a long while I've been using SpeedFan to report temps etc, occasionally glancing at the values it puts out for the SMART readings on my drives. The only problem is that only my 2 EIDE drives are showing up. I just figured it may have been a limitationwith SpeedFan, and left it as is. I have since added more drives, and still none of them show any SMART data, even for drives that I know support it. I've checked it with various other HDD monitoring utilities as well to confirm that the limitation is not within SpeedFan, and the results are the same.

I've gone through and checked every setting in the CMOS, the various programs, and the OS, and nothing has worked yet.It's not something vitally important to me, but several of my drives are becoming relatively old, and some extra checks to ensure longevity would be nice. Is this a known issue, or is there anything else that I can go around and change in order to try and fix this?

My system:

OS: Vista Ultimate x64
Mobo: MSI P6N SLI Platinum (NVidia 650i NB, NVidia 430i SB)
EIDE Drives:
-Seagate 500 GB ST3500841A
-Western Digital 250 GB WD2500JB

SATA Drives:
-Samsung 500 GB HD501LJ
-Samsung 1000 GB HD103UJ
-Seagate 320 GB ST332062
-Western Digital 750 GB WD7500AAKS

Thanks for any insight you can give.