Freecom 31994 Serial ATA Controller - 1 Serial ATA/300 Serial ATA, 1 Serial ATA/300, 1 USB 2.0 - USB/eSATA. Have an older hard drive laying around after a system upgrade? Are you a system administrator who needs to install multiple hard drives? Looking for a good solution to easily connect and use your internal hard drive? Look no further - this is the Freecom Hard Drive Dock, a docking station that turns any internal 2.5inch and 3.5inch SATA hard drive into an external drive. Simply click your internal hard drive in the dock, and it instantly becomes available to you, it will show up as either an external USB 2.0 or eSATA device. No easier way to install and use an internal drive, ideal for temporary use of your (old) internal hard drive. An intelligent and convenient storage solution by Freecom.