Aleratec 350129 1:5 HDD Copy Dock Advanced Hard Disk Drive Duplicator is your ideal tool if you are looking to duplicate hard drives in large quantities. This device is designed to copy up to 5 hard drives simultaneously without the need for a computer. The dock supports 2.5" and 3.5" SATA I/II hard disk drives of any capacity and the sector-by-sector copy mode ensures that the target hard drives are identical to the source hard drive. If you want to copy just selected files and folders, the dock also has a normal copy mode for your convenience.