You could use the Thunderbolt to Firewire adaptor Artie suggest from the iMac and simply plug your existing Firewire cable into that. The Thunderbolt to Firewire adaptor costs $30 and a good USB 3 hub costs $15, but either option would be easily fast enough to handle your drives your drives.

If you are an overachiever or a gadget freak for $219 you could get an OWC Thunderboolt 2 Dock and get
  • Dual Thunderbolt 2 ports for daisy chaining
  • An Ultra HD—4K display port
  • Five USB 3.1 Gen 1 ports includint two high power charging ports
  • Firewire 800 port
and plug in the world. smile


"All you've got to do is own up to your ignorance
honestly, and you'll find people who are eager to
fill your head with information"
--Walt Disney