About RAID

RAID is an acronym for Redundant Array of Independent Disks. With RAID enabled on a storage system you can connect two or more drives in the system so they act as one large volume fast drive or set them up as one system drive used to automatically and instantaneously duplicate (or mirror) your data for real-time backup.

What does RAID 1 for
My Book Live Duo mean?

Set the system to data protection mode (also known as mirrored mode or RAID 1) and the capacity is divided in half. Half of the capacity is used to store your data and the other half is used for a duplicate copy. In the unlikely event that one drive fails, your data is protected because it's duplicated on the other drive.

About Spanning

Spanning combines all the drives in a system into one large volume so they act as one giant drive. Though spanning does not offer the protection of RAID modes, the advantage of spanning is that you use the maximum capacity of the system. My Book Live Duo ships in this mode.