Cavalry Storage CADB-U34 Series 4 TB USB 4-bay JBOD Personal Disk Array CADB004U34 4 TB total capacity in two (2) 2 TB partitions USB 2.0 interface; plug and play for Windows 2000 and newer (pre-formatted to NTFS) Hot swappable, spring-loaded drive bays Unit Includes - One (1) year manufacturer's warranty, four (4) 250 GB 3.5-inch hard drives installed in a quad bay enclosure with built-in fan, USB cable, AC adapter, Resources CD and Quick Start Guide System Requirements - Available USB port, Mac OS 9.x or newer, Windows 98SE / Me / 2000 / XP / Vista