Upgrade to Fedora 12 the hard way?

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http://forums.fedoraforum.org – I seem to be having a similar problem to many in this forum where a Fedora 12 install fails to find any SATA hard disks (Asus motherboard with Via raid chipset) although Fedora 10 installs and runs great. I tried the DVD full install disk, the net install, and the upgrade from within Fedora 10 (where the installer can't detect the hard disk it just booted from). I also tried installing the latest openSUSE with similar results. This may be a newbie question, but since Fedora 10 works on this machine can it updated a piece at a time to get to Fedora 12 or are there too many dependencies or other things going on to allow this to work? (HowTos)