The 1:1 HDD PortaCruiser is both a powerful HDD duplicator and a versatile Dual-Disk RAID Controller in one lightweight, portable device. Make perfect copies/backups of entire hard disk drives or access your drives via USB 2.0 connection to your computer and set up a RAID 0, RAID 1, JBOD Spanning) or Normal disk configuration. This essential tool for building,upgrading and backing up computer systems requires no computer to run, eliminating the need to tie up a computer for hours running complex software to duplicate hard disk drives. Additionally, this fully-featured duplicator gives you total control with advanced functions such as Compare, Prescan, and Erase.