|Also, watch the POST screens at start up to verify the drive is being configured in the BIOS. |
WinXP does not natively support SATA type hard drives. Depending on the motherboard you are using the settings in the BIOS may need to be changed or SATA drivers must be supplied at the beginning of the installation process.
One other thing to note. If the WinXP installation disk does NOT include any service packs then you will have problems with hard drives larger than 127GB.