The TowerRAID series is a compact, easy to install, 4-bay SATA enclosure for hard drive storage expansion. The TowerRAID series allows the connection of up to four hard drives with one single cable, which instantly adds up to 4TB of additional storage. The TowerRAID series features hard drive bay cover, cable-less backplane, and tray-free swappable designs in USB 2.0 and eSATA Port Multiplier models.