my advice would be:
once you have decided on the manufacturer of your hard drive.
compare the length of warranty on an internal drive vs. the external drive. My experience was the external drive was in a sealed box, with a 1 year warranty, while the same drive , sold bare, had a 3 yr warranty. might tilt you towards a bare drive with an enclosure.

I believe firewire is faster than usb 2.0, theoretically and real world throughput.

hth


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