2-Bay, 8TB Personal Cloud Storage includes 2 x 4TB HDD</br>The My Book Duo drive ships in RAID 0 for maximum performance and capacity. Customize with RAID 1 for ultimate data protection or JBOD to use the drives individually.</br>High-capacity external storage and backup. Ultra-fast, optimized data transfer speeds. Protecting your data with multiple backup options</br>Complete backup solutions to secure your data from loss - Integrated backup software, Cloud backup with Dropbox, System-level backup</br>Speed and security with hardware encrypted RAID</br></br>Product Description</br></br>2 x Total Bays - USB 3.0 - 0, 1, JBOD RAID Levels External</br>