* RAID 1

Two or more disks are used to store the data as exact images of the other. As data is being written or read from one disk the RAID controller “mirrors” this data to the other drive/s. This provides a high level of redundancy as if one drive fails the other has a full working set of data. However, it means that you would only be able to have as much storage space available as the size of the smallest disk in the RAID array. E.g. two hard drive of 256GB and 512GB, would appear as a single 256GB drive.