RAID one presents comprehensive redundancy. With 2 drives, it'll mirror all data to one other push, with 3 drives, it'll mirror to each one other drives. Ex. You have got two 1TB drives in a very RAID 1, you will have 1TB of usable House and 1TB of redundant storage. https://542975.wikinstructions.com/663910/wiederherstellung_for_dummies