AHCI and RAID on HP Compaq Elite 8000, 8100, and 8200 Business PCs

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In the previous table, each “Data Segment x” represents a strip. A stripe is made
with strip “Data Segment x”, “Data Segment y” and strip “Parity for x and y.”
Notice that the strip “Parity for x and y” is used to store the required information to
recreate the data if any one of the RAID volume members is compromised.
To better illustrate the concept of RAID 5 (parity-based RAID), Figure 4 shows how
a sequence of data “ABCD...” is stored in a RAID 5. In this example, each letter
represents a segment or strip. The various pieces of the information go to different
hard drives, hence if any one member of the RAID 5 fails, the information from all
members is not lost.
Figure 4. RAID 5 with three hard drives