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RAID 5 stripes data across all disks in the array.
In addition to data, RAID 5 also writes array parity data. The parity data is spread across all the disks. For a RAID 5 array of three disks, array data and parity information are written in the following pattern:
If a disk fails in a RAID 5 array, you can continue to use the array normally. A RAID 5 array operating with a single failed disk is said to be operating in degraded mode. Whenever data is read from a degraded disk array, the array controller recalculates the data on the failed disk by using data and parity blocks on the operational disks. If a second disk fails, the array will be placed in the failed state and will not be accessible.
