From the Manufacturer
SmartDisk PCI and CardBus Cards offer instant expansibility for computers that don't have FireWire (IEEE 1394) or USB 2.0 Hi-Speed connectivity as standard. As more and more peripherals use these high performance standards you need SmartDisk's easy-to-install cards to get your computer connected at maximum speed. Both the USB 2.0/FireWire and FireWire-only cards feature a direct power connector that allows safe FireWire "bus" powering of multiple devices. Cards without this feature draw all their power from the PCI bus, which can lead to instability problems. All of SmartDisk's PCI and CardBus cards come complete with an easy-to-follow printed user guide and all necessary software drivers.