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.