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A RAID level that uses a combination of striping and parity to enhance the security of data storage. With RAID 4, data is striped across the multiple component disks in the RAID at the block level. Parity information is stored on a dedicated disk. With a RAID 4 system, the data will be able to survive the loss of any disk in the RAID, including the disk that the parity information is stored on. RAID 4 is nearly identical to RAID 3; the difference is the size of the stripes that are written to the disks in the array (blocks of data, rather than bytes).

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