20 terabytes might seem like a massive amount of storage right now. But with your 4 & 8K footage and other big-boy files, it makes sense to plan ahead. The My Book Duo drive offers 20TB capacity and in RAID-0 mode, provides super-fast performance with up to 360MB/s2 sequential read speeds. Or, use RAID-1 mode for redundancy. The two internal RAID-optimized WD Red drives also allow you to use it as two independent drives.