XP knows nothing about SATA drives. I see no comments about how you installed XP so I take it you didn't install SATA drivers or motherboard drivers.
Widely documented on the web too...
Bob
Hi, i don't know much about computing, so sorry for seeming stupid in advance.
I recently bought a 2nd hand computer with really nice specs, including Vista Ulimate and dual 74gig raptors in raid0 (I think). It was working fine except the occasional freezing/problems during hard gaming sessions which i put down to incompatibility with Vista. Yesterday I decided to install xp pro. I am not sure what happened (I didn't open the case or change any sort or configuration) but I didn't get far into installing xp pro before the system told me it couldn't detect either of my hard drives. I thought it might be a RAID problem (don't ask me why) so I went into the raid set up during booting and deleted the raid0 array. I have tried also booting with the Vista disk as well as xp pro but each time my raptors aren't detected and therefore the OS can't be installed/fixed. I have been to the Western Digital website and downloaded/created their drivers/utilities but I suspect they aren't vista compatible. The apparently bootable discs weren't recogised (the iso images/driver weren't detected by both the vista setup and xp pro setups. I don't know what else to do. I have contacted the seller as he made it all work previously but he hasn't replied yet.
Can anyone help? And thanks in advance if you can.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic