http://www.buffalotech.com/products/desktop-hard-drives/drivestation/drivestation-ddr I received my Buffalo Drivestation DDR a few days ago after someone on here recommended it in another thread. I thought this drive is so fast that it should have it's own thread so people know about it. It's a different type of technology. It uses a regular 3.5" mechanical hard drive but has DDR memory as a buffer between the Mac and the hard drive. The end result is that it is 2.3x faster than a regular USB 3.0 drive. Think of it as close to SSD speeds and with the storage (and low cost) of a traditional hard drive, sort of a simplified Fusion Drive. Here is a CNET review, with video: http://reviews.cnet.com/hard-drives/buffalo-drivestation-ddr-2tb/4505-3186_7-35757049.html I love this as an external drive, I'm thinking of buying another and using it as my boot drive instead of my 256GB Samsung SSD. A 3TB SSD-type speed for a boot drive would be awesome. The best part is that these are inexpensive when compared to other external USB 3.0 drives. The 2TB version is $133 and the 3TB version is $172 at Provantage (the 3TB cost me $179 shipped, a few dollars less than Amazon, even with Prime). You do need to install Buffalo's cache app (available in Mac and Windows versions) to take advantage of the built in DDR, otherwise it runs at normal USB 3.0 speeds.