How does daisy-chaining of external drives work?

Discussion in 'Mac Basics and Help' started by c-t, Jan 25, 2012.

  1. c-t macrumors newbie

    Joined:
    Jul 29, 2010
    #1
    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:
    1. Connect the LaCie to the iMac's FW400 port and connect the new WD to the iMac's FW800 port.
    2. 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?
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    Option 2 will work just fine, I currently have three HDDs connected to my iMac that way, all with FW800 ports and I get FW800 speeds too.
     
  3. c-t thread starter macrumors newbie

    Joined:
    Jul 29, 2010
    #3
    Okay, thanks. What if you're transferring files from all three drives at once to your Mac (or between one another)? Do things slow down?
     
  4. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #4
    If I copy from three HDDs via one interface (FW800 in this case) to one HDD, I will be limited by the interface and the one HDD, which has to write three streams onto it.
    If I copy from on external HDD to another external HDD via FW800, I get FW800 speeds.
     

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