The DriveStation DDR line of external USB 3.0 drives from Buffalo (in capacities from 2 to 3 TB – the 2TB version is reviewed) make the bold claim on the box that you should “Compare to SSD!” when considering them. That claim is based on the speed up you get from the 1GB of included DDR RAM inside the enclosure which provides a dedicated buffer for the device. That buffer, along with the use of a speedy Seagate Drive using a 6MB/Sec SATA connection to the also speedy USB 3.0 connection the enclosure's hardware also provides mostly delivers on that claim.
The Gadgeteer , Buffalo DriveStation DDR review
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, Buffalo DriveStation DDR review