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 do the RAID modes of WD Sentinel mean?

 Data protection (RAID 1)

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 half is used for a duplicate copy. If one drive goes down your data is protected because it's duplicated.

 Data protection and speed (RAID 5)

WD Sentinel with three or four drives is automatically set to RAID 5. This gives you the best of both worlds: fast performance by striping data across all drives, and data protection by dedicating a quarter of each drive to fault tolerance leaving three quarters of the system capacity available for data storage.