1394A external device can't be recognized

techo

hi All,

is there any one had experienced 1394A external device can't be recognized under OS?

; r' {: A$ M4 G; I. ?I encounter this kind of issue recently.

! ^; y- G" X9 D; {; L% {9 JOS is Vista & XP.
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* O& M- W( y$ f/ o# {9 i% }1394A controller is Ricoh.

, |2 D% k3 l$ lthe situation is I could see the removable icon shown on the system tray but there is no device in OS device manager.

indeed there are some differents but I don't know why.
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I wonder it's caused by BIOS but how to prove it?

is there any spec or document could let me refer to?

3 z- m9 j* X: H- p; S. D, sThanks anyway!