Hi Fahim
I bought a cheap firewire PCMCIA card from ebay, and supposedly it gets power from the USB port (a plug is included that goes from USB to the card), but it didn't power my DMK and I doubt it would power your DX.
I had to get an external powered hub, about $80 from streetwise.com.au
240v into the hub, firewire cable from the PCMCIA card to the hub, 6-pin to 6-pni firewire cable from the camera to the hub.
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