Daisychaining of external hard drives

Discussion in 'Buying Tips and Advice' started by Crazy-Horse, Apr 30, 2007.

  1. Crazy-Horse macrumors newbie

    Crazy-Horse

    Joined:
    Jan 12, 2007
    Location:
    N. Ireland & Bristol, UK
    #1
    Hi folks,

    I've been planning on purchasing a 1TB external (USB, FW400/800, most likely a Lacie Big Disk Extreme, at least i think that's what they're called) drive to complement my current WD MyBook USB 250GB drive. What I was wondering is, will it be possible for me to daisychain the USB-only drive to the triple interface one (does USB to USB work in this respect, or is there such a thing as a USB to FW cable)?

    Also, on the subject of multiple drives, I currently have my iTunes library assigned to the MyBook... is it possible to have the library spread across two drives, while keeping it organised?

    Thanks in advance :)
     
  2. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    You cannot daisychain anything using a USB connection. Some devices may be able to re-host the USB device (this tends to be true of NAT boxes which run as the host) but I don't think so in this case.
     
  3. Crazy-Horse thread starter macrumors newbie

    Crazy-Horse

    Joined:
    Jan 12, 2007
    Location:
    N. Ireland & Bristol, UK
    #3
    Darn, there goes my dream of a free USB port... :(
     
  4. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #4
    Erm...USB2 hub? Hello?
     
  5. Crazy-Horse thread starter macrumors newbie

    Crazy-Horse

    Joined:
    Jan 12, 2007
    Location:
    N. Ireland & Bristol, UK
    #5
    Hello, very true, it was just a bit of a throwaway remark ;)
     
  6. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #6
    Yeah, I guess it's subideal vs. having Firewire's speed, but it should usually treat you fairly well to have them both driven off a powered hub. :)
     
  7. dmelgar macrumors 68000

    Joined:
    Apr 29, 2005
    #7
    Firewire much faster than USB

    With that much disk space, I'd strongly advice using firewire instead of USB. I had heard stories that firewire was faster, but didn't realize how much faster until I benchmarked it myself.

    Firewire (400mbit) I can get sustained 36MB/sec, ie megabytes/sec. thats smokin and close to the ~40MB limit.
    USB (480mbit) to the same drive I can only get ~16MB/sec. Less than half the speed.

    Given that big a difference, I'd definitely go with Firewire. Its also impressive how reliable Firewire is. I daisychained a DVD burner to the above hard drive. While reading at 36MB/sec, I was also able to watch a movie at ~1MB/sec with no hickups.

    PS, numbers here are from memory, I could be off a little, can double check tonight.
     

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