Logitech 1.5TB External HDD - The connection you can choose between a single or a USB 2.0 enclosure USB 2.0 and FireWire 400, eSATA and a USB 2.0 and eSATA one. If you think that is too large to 1.5TB of storage, you can choose the series LHD-ED, which has less capacity to make 250GB.
