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    Short answer, not efficiently. It will work, but it will be molasses. You can't force a USB2 post to be USB3. Get the largest drive you can & use it internally. Those iMacs take standard 3.5" drives - now available up to 8TB.
    – Tetsujin
    Commented Jun 23, 2015 at 6:50
  • Yeah it seems to be the consensus. Financially I'm relegated to a 2TB internal or Firewire external. Thanks for the help Tetsujin.
    – secondman
    Commented Jun 23, 2015 at 11:03
  • I guess the only question left would be, is there a difference in the external drive being a powered device versus just a USB device? All the drives I'm looking at are AC powered, not just plug and play USB devices.
    – secondman
    Commented Jun 23, 2015 at 11:07
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    Nope, still gonna be slow as all hell ;)
    – Tetsujin
    Commented Jun 23, 2015 at 11:11