
It is possible to transfer a single hard drive into a RAID array and migrate a simple RAID array into complex ones. For example, you can transform a RAID 0 array with three hard drives or a RAID 1+0 with four hard drives into a RAID 5 configuration with parity. However, you cannot enhance a RAID 5 array with three hard drives by adding yet another drive. But you can make it possible for an additional hard drive to become available as a spare device to automatically replace a broken drive. After transforming a simple RAID array into a complex RAID array, the process cannot be reversed..


