Your answer is - some hard drive SATA controllers, especially RAID controllers, but also some normal ones as well - Require a Driver!!!!!
Get the driver, load it up on a 3.5" disk and when you are booting the XP CD, you will see something saying 'hit F6 to install additional hard drive drivers'. This happens only for a second before the XP CD boots, so look for it on the bottom.
Let me know if you have any problems.
-S
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