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?
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I encounter this kind of issue recently.

OS is Vista & XP.
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9 D4 f6 Q+ u$ [  I& Y. r1394A controller is Ricoh.
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the situation is I could see the removable icon shown on the system tray but there is no device in OS device manager.
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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?
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+ ^: X5 z6 k" i/ a: k7 j6 xis there any spec or document could let me refer to?

Thanks anyway!