This SATA hard drive dock/docking station can be mounted internally in a 5.25in computer drive bay, to provide simple access to 2.5in or 3.5in SATA hard drives. Featuring a convenient trayless design, the internal hard drive dock doesn't require that hard drives be mounted in an enclosure, saving time & hassle. Once the docking station is connected to the host computer, it's as simple as inserting the desired SATA hard drive into the slot (s) as needed for full access to the hard drive (s) as though installed conventionally within the computer case.