For those of you who have the VIA 6421A Sata Controller PCI card and had trouble getting it to recognize in Windows XP SP2, I figured I would make a post.
http://www.viaarena.com/default.aspx?PageI...mp;SubCatID=117
The above link has the drivers needed to install it for windows recognition. Windows will not recognize it by default post-SP1 apparently. After doing that, use Xtreme Boot Maker to edit the mktflash - otherwise it will not read or recognize in DOS.
Once that is done, you should be on your way. I hope this is helpful, as I know when I was searching for my answer, I found many questions. The card I bought was nGear branded from www.ncix.com