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For creating a slightly more lasting connection, there's the U357 USB SuperSpeed External 2.5" SATA Hard Drive Enclosure, a USB 3.0 external 2.5-inch drive enclosure. With the exception of 3.5-inch drive support, the U357 performs largely the same functions as the U339 but is intended more as an end-user sale for supplemental storage or file backup for laptops, netbooks and even desktops.
At 5.25 inches long by 3.25 inches wide by a half-inch high, the unit is small enough to slide into a pocket or travel unnoticed in a laptop bag along with its USB 3.0 Micro-B connector cable.
No power supply is required for most systems (and none is included), and the device runs with all versions of Windows and Mac OS X with no special drivers. In tests using the same Intel SSD drive and testbed as for the U339, the U357's transfer rates were identical. The U357 lists for $45 and can be found for around $23 on the street.