Definitions for "RAID 3"
(requires 3+ drives) - data block is striped at byte level across drives and error correction codes (parity info) is recorder on another drive. Provides fault tolerance but slower writing performance.
Redundant Array of Inexpensive Disks – parallel array with parity. The distinguishing feature of level 3 is a single parity drive to accomplish redundancy. This is achieved by interleaving the parity information at the byte level. Typically, the drive spindles are synchronized. It still requires that all disks in a group be accessed, even for small transfers, with the wait for the slowest to finish before the transfer is complete. Spindle synchronization is expensive and often limits the choice of disk elements. See also RAID.
Striping (small stripe size) with one parity disk.