Buy.com offers the Hitachi Duo Pro 4TB eSATA / FireWire / USB 2.0 External Hard Drive, model no. PROD4000Q, for $259.99 with free shipping ($0.06/GB). That’s $40 under our October mention and the lowest total price we’ve seen for a 4TB quad-interface hard drive by $15. This quad-interface (eSATA, FireWire 800, FireWire 400, and USB 2.0) drive features two 2TB hard drives.
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