Century Intros 4-bay External HDD Enclosure with Individual Disk Power Switches
 

Have you ever felt the need to have control (which can't be second-guessed by the OS) over which drives stay active in your multi-bay drive enclosure? If so, this enclosure (model: CRCH35U3IS) from Japanese peripherals vendor Century could be a Godsend. The enclosure allows you to manually toggle power to individual drives. It features four 3.5-inch SATA 6 Gb/s lockable caddies, and connects to its host over USB 3.0 SuperSpeed interface. A single SSD has been tested to achieve transfer rates as high as an honest-sounding 400 MB/s. The enclosure is cooled by a temperature-activated fan, which can be overridden. Measuring 130 x 260 x 185 mm (WxDxH), the enclosure weighs about 3.2 kg (probably because it includes a power supply). Slated for early-December, it is priced at 17,800¥ (US $220)

http://www.techpowerup.com/175812/Ce...-Switches.html