The DD4 USB Raid is the easiest way to expand storage capacity to your computer and ensure you always have an up-to-the minute backup copy of your SATA hard drive. It is an External USB, two-drive RAID 1 enclosure with two removable key-lock protected drive caddies. Drives can be easily accessed and removed for safe keeping or swapped out and replaced. One touch setup and operation gives even the most non-technical users access to the complete redundancy of RAID1 disk mirroring.The stand alone DD4 USB Raid provides hot swap functionality. This means that when a new drive is inserted to replace a failed drive, the DD4 USB Raid enclosure simply notifies the user (by audible and visual alarm) and automatically begins to transfer data to the new drive to establish a new mirror. This data transfer will take place in the background and the SATA drive mirroring will not interfere with the operation or use of the existing drive.
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