The StarTech 4-Bay eSATA USB 3.0 to SATA Hard Drive Docking Station is a convenient, time-saving storage solution for 2.5 inch/3.5 inch SATA hard drives and solid state drives allowing for up to four SATA drives to be conveniently and quickly connected to a host computer through a single connection. The hard drive docking station features SuperSpeed USB 3.0 connectivity (also compatible with USB 2.0) with support for data transfer rates up to 5Gbps (10 times faster than USB 2.0) or eSATA with Port Multiplier connectivity (up to 3Gbps), to provide fast connectivity to all four hard drives simultaneously. The eSATA/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 and operating environment, or turned off completely.