I can't speak from experience, but my understanding is there's little to choose between the two(usb 2 & Firewire) in the real world. I seem to remember Firewire has the edge. Most Pcs have usb ports so this is more likely to be flexible though. However as Anon1 suggested, unless you need to carry data between 2 pcs a 2nd internal drive would be cheaper, & I can't see why less effective - unless you need to keep data from prying eyes.
How many ide devices do you have connected? Most ribbon cables come with an adapter to allow 2 devices to be connected eg hard drive and cd. unless you have a very small pc case then you can always add a bay for hdd it is just a matter of adding a carrier
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