mattyuk,
There are several things that you need to do/check. Make sure that your MB BIOS is up to date. The latest for your board I believe is Nov 2005. Check the Sapphire support for your latest BIOS and also download all the drivers they have on their site because you will need them during the setup especially the ATI SATA drivers. Here's the site:
http://www.sapphiretech.com/en/support/drivers.php (choose your MB)
http://www.sapphiretech.com/en/driverfiles/78.pdf (your MB Manual)
Then what you'll need to do is:
- Prepare a floppy with the SATA drivers.
- Configure your BIOS for RAID (see the manual above for details)
-- You need to enable "OnChip SATA Controller (Both)"
-- You need to set "OnChip SATA Type" to IDE if you have one Drive or RAID if you have more than 1 SATA HDD.
- Boot Priority should NOT be SCSI. You should boot from the first Hard drive. Once you configure your OnChip SATA type you should see the new drive in the boot priority section.
- Now stick the floppy with the ATI SATA files on it (you'll have to unzip what you download from the sapphire website onto this floppy).
- Stick the Windows XP CD and power on.
- When you see the F6 at the bottom PRESS IT QUICK

. It only lasts for a few seconds so if you miss it then you'll need to reboot again. This step will allow Windows to read the SATA drivers for your controller so that Windows can see the drive (this is why you couldn't see the drive before).
Then the rest should be standard once you actually do read the new drivers for your hard drive and you should be familiar with the rest of the install (i.e. normal Windows install at that point).
Good luck.
Casey