I have an iMac with one FW800 port and one FW400 port. I already have a LaCie Rugged drive with one FW800 port and one FW400 port. I have it connected to my iMac's FW800 port. Now, I want to connect a second external drive to my iMac. I'm thinking about buying WD My Passport Studio with two FW800 ports. My question is: There are two choices I can take in order to connect those drives to my iMac: Connect the LaCie to the iMac's FW400 port and connect the new WD to the iMac's FW800 port. Connect the new WD to the iMac's FW800 port, and daisy-chain the LaCie to the WD's remaining FW800 port. My question is: Which option should I choose? I guess option 2 would be better, since both are on the FW800 bus. However, since there are two drives on the same bus, doesn't it slow down the entire bus?