Ok what you need to have on either a floppy or CD (what ever for your system) is the SCSI controller drivers in an unzipped condition. Reboot to the XP installation disc and shortly after you are prompted to "boot from CD press any key" then you will be prompted again to "install thired party or RAID drivers press F6" you will need to press the F6 key and wait till you are prompted again to load the driver files on the floppy or CD.

After the driver files are installed then you should be able to see the other partitions!