Enable quick access to four 2.5"/3.5" SATA HDD over USB (Universal Serial Bus) 3.0 or e SATA. The SATDOCK4U3E e SATA & USB (Universal Serial Bus) 3.0 4-Bay SATA Hard Drive Docking Station is a convenient, time-saving storage solution for 2.5-inch & 3.5-inch SATA hard drives (HDD) & solid state drives (SSD) allowing for up to 4 SATA drives (tested with up to 4TB 3.5" & 1TB 2.5" drives per bay) to be conveniently & quickly connected to a host computer through a single connection. The hard drive docking station features Super Speed USB (Universal Serial Bus) 3.0 connectivity (also compatible with USB (Universal Serial Bus) 2.0) with support for data transfer rates up to 5 Gbps (10x faster than USB (Universal Serial Bus) 2.0) or e SATA with Port Multiplier connectivity (up to 3 Gbps), to provide fast connectivity to all 4 hard drives simultaneously. The e SATA/USB 3.0 SATA hard drive docking station also features dual built-in, variable-speed 60mm fans that can be manually adjusted to keep each drive running cool, depending on the drives & operating environment, or turned off completely. Double the value of this hard drive docking station, using a SAT2IDEADP SATA to IDE hard drive adapter (SAT2IDEADP), which enables you to use any 2.5 or 3.5in IDE hard drive in a SATA hard drive dock slot.