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I have a G-Technology G-Drive mobile 1TB with the option of either connecting via USB 3.0 or Firewire 800, which is the better choice for connecting with my MacBook Pro Early-2011? (In terms of speed or other considerations)

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Well, in terms of speed, USB3 is far faster than Firewire. USB3 transfers at 5 Gbit/s, while Firewire 800 is only 3200 Mbit/s.

USB does require more CPU overhead, but the loss is negligible.

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