[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

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Dago Pacheco
Encargado de Informática
Maestranza Makimet Ltda.