WD 4TB My Cloud Mirror External Hard Drive

The 4TB My Cloud Mirror External Hard Drive from Western Digital comes with two 2TB hard drives for a total storage capacity of 4TB. This dual bay hard drive allows you to configure the drives in a variety of RAID configurations including RAID 1 (default mode), RAID 0, JBOD, and spanning modes. With the default RAID 1 configuration, otherwise known as mirror mode, all of the data you save to the My Cloud Mirror is backed up automatically to the secondary drive. This configuration ensures that your data is backed up in case the original drive malfunctions or fails.