|Hopefully you didn't pay much?|
What are you trying to do with the HDD, install XP on it? XP doesn't natively support SATA HDDs. The drive will not be recognized until you do one of 3 things:
1. go into the BIOS & change the HDD setting to 'IDE compatibility' (if available)
2. start the XP installation, then press F8 & load the SATA drivers from a floppy disk
3. create a new XP CD with the SATA drivers slipstreamed into it.