Hmm this is an interesting topic I was looking into myself I have two Microdrives but my Cam is A Minolta Dimage 7HI and this is USB1 so the transfer rate is a bit slow on 512 and 1 GIG so lord knows what its like on a 2.2 GIG drive if you have USB2 or Firewire then is will be ok.. On my intended upgrade to A Canon 10 D I will have the same problem IE USB1.. If your own Camera does not support the faster transfer rates you may find two 1 gig or 4 512 cards may give you more flexability as changing cards is quick..

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt