Download the driver for your PCMCIA SATA Card -
http://www.viaarena.com/Driver/vraid_driver_v550b.zip Always use latest JungleFlasher.
Don't forget that
VIA VT6421 PCI to SATA cards include an e-SATA port if your motherboard doesn't already have.
http://www.diygadget.com/vt6421a-raid-pci-sata-controller-card-for-xbox-360.html You will also need a SATA to e-SATA cable.