i agree with Sean, but want to expand on it. if you’re doing effects and color correction, or if you have a slower computer, you wont want to use HDV as your editing codec. by capturing directly through the card to the high res codec you want (such as ProRes or Uncompressed), you will save the step of transcoding after capture. but you lose one main benefit of HDV – start/stop detect. at my old facility, we would capture HDV via Firewire using start/stop detect. then those clips would be logged (and subclipped if needed). then we would recapture the clips at a higher res codec such as ProRes or Uncompressed. this footage was much easier for our After Effects guys to deal with. it also made the older G5 computers snappier because these codecs take less processor power to playback and edit than HDV. and no HDV Conform at the end!
but if you’ve been using HDV for editing just fine and without issue, then keep using the firewire method.
e
Eric Hansen, The Audio Visual Plumber – http://www.avplumber.com