It requires a minimum of two drives to operate. For our purposes, we will cover the top 3 standard versions and one nested version. There are 7 standard levels of RAID storage numbered 0-6 and many more substandard which are nested versions. Some RAID groups have one or more disk drives that contain parity information that allows them to rebuild data if a drive failure occurs. RAID storage devices use enhanced forms of parity checking. Parity: A technique that checks whether data has been lost or written over when it is moved from one place in storage to another. If one disk fails, the other can be used to retrieve data. The disks are essentially mirror images of each other. All the data is written to at least two separate physical disks. Because striping spreads data across more physical drives, multiple disks can access the contents of a file, allowing much faster writes and reads.ĭisk Mirroring: Just like it sounds. Basic RAID Terminologyĭisk Striping: A technique that breaks up a file and spreads the data across all the disk drives in a RAID set. RAID serves two main purposes: performance and protection. There are several flavors of RAID types which take advantage of the multiple hard drives in different ways. Those aren’t just a string of fancy words put together, they are a pretty good description once you understand how RAID works.Ī RAID system uses two or more hard drives that are linked together and appear as one disk called a RAID set. RAID may sound pretty ominous but it is actually an acronym for Redundant Array of Independent Disks.
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