Firewire 400 workaround

Discussion in 'iMac' started by mucmacian, Sep 10, 2007.

  1. mucmacian macrumors newbie

    Aug 15, 2007
    Some people may be experiencing issues connecting Firewire 400 devices to their new Aluminum iMacs.

    At least for me, I've been messing around with an iBook G4 and my new 24" iMac, beeing unable to get the iBook connected to the iMac in target mode.
    After a long lasting call with a very kind person at Apple Support, they contacted some cupertino based third level support guys and came up with a workaround:

    As they stated, few users are having problems with Firewire 400 devices, even when connecting several Apple computers (depending on model and revision) in target mode to their new Aluminum iMac.
    As far as I understood, the issue is related to low voltage input (diverging from Firewire specification?!?), meaning, the connected device is not able to deliver enough power through Firewire to work properly.

    Simply connect the device using a Firewire hub with its own power supply, and things will work fine. At least, they did for me.

    I hope that helps somebody.
  2. mkrishnan Moderator emeritus


    Jan 9, 2004
    Grand Rapids, MI, USA
    That's interesting, thanks! USB and Firewire have a lot of these power headaches. On the one hand, I wish my FW400 drives could run off bus power, at least in a pinch (they're Icy Docks, and they only run with dedicated power). But then again, I'll put up with the more cables for safety of my data, you know?

    But now... you're plugging an iBook into an iMac in target disk mode. Why on earth does the iBook need to draw power from the iMac?
  3. mucmacian thread starter macrumors newbie

    Aug 15, 2007
    Yeah, if only I knew. Even the Apple Support guy seemed a little bit embarrassed at all. ;)
  4. whistler72 macrumors member

    Aug 5, 2007
    when my iMac crashes, I boot it back up and it NEVER seems to find my FW WD external drive. It will only work when I boot it into windows and then back into OSX.

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