http://www.hitachigst.com/hdd/support/7k100/7k100.htm
If you have a Hitachi HD from Dell (like me, THANK YOU DELL!!!) then goto the above page. Goto Device Manager and under Disk Drives you'll see the model number in the devices name.
Mine is this:
HTS721060G9SA00
Which Hitachi says is this:
60 7200 Serial-ATA
The SA00 means SATA, while AT00 means ATA6 (PATA).
"A05 BIOS revision provides this support in the newer motherboards that were introduced with the m170 change-over." <--- That's what an hour in the middle of the night with someone in the Phillipines gets you.
p.s. I had no idea they spoke english w/o an accent over there. Second time I've talked to someone there that I could actually talk to. And they small talk well too, understand expressional speaking very well.