[CentOS] Can't connect firewire HD

Hi..... I just bought a External HD with USB/FireWire interfaces. I was trying to connect it by firewire and nothing happened, but it's connected by USB, there is no problem. This is the "fdisk - l" output when i connect it by USB

Disco /dev/sdc: 160.0 GB, 160041885696 bytes 255 cabezas, 63 sectores/pista, 19457 cilindros Unidades = cilindros de 16065 * 512 = 8225280 bytes

With firewire, there is just nothing for the external HD The firewire port it's integrated to my motherboard as an ATX form card. The USB port where i connect the HD is in the same card

Hope u can help me. Thanks a lot