My Book Thunderbolt Duo 4TB Dual-Drive Storage RAID 0/1. My Book Thunderbolt Duo, dual-drive storage system featuring revolutionary Thunderbolt technology, sets new standards for data transfer speeds and workflow flexibility in high-capacity storage. Move data at unprecedented speeds Finally, a drive that can keep up with your creativity. Video editors and other digital media professionals can do more work in less time with the ground-breaking data transfer speed of the Thunderbolt ports on My Book Thunderbolt Duo. It offers the indisputably fastest way to get information to and from your external drive. Dual drive RAID storage system User selectable RAID or JBOD modes. When set to RAID 0 (striping), My Book Thunderbolt Duo offers the performance you need when designing or editing graphics-intensive media files. When set to RAID 1 (mirroring), this drive provides double safe data protection by automatically generating a duplicate copy of your data. Set to JBOD (Just a Bunch Of Disks) to use as two individual drives and select between HFS+J or exFAT per disk. Ideal for running Windows OS on a Mac. Dual Thunderbolt ports enhance workflow efficiency Daisy chain up to seven devices or peripherals using the two Thunderbolt ports to achieve maximum workflow efficiency and productivity. High-speed multi-tasking The revolutionary bi-directional Thunderbolt technology delivers unmatched speed for multi-tasking while video editing, 3D rendering and completing other graphics-intensive projects.User-serviceable Want to replace a drive? Simply open the case and exchange the existing drive no tools needed. If you fill up a drive, you can simply remove it and replace it with a fresh drive and begin saving even more of your creative life. WD Drive Utilities Register your drive, run diagnostics, manage RAID or JBOD modes and more, using WD Drive Utilities. Cool operation Equipped with WD drives, this system is designed to run cool. Lower operating temperatures extend the life of the drive and improve data reliability.