User`s guide

Chapter 2. RAID Array Controller
EK–SMCPO–UG. A01 2–15
2.6.4 RAID 4
RAID 4 breaks up host data into chunks, calculates parity by performing an ex-
clusive-or on the chunks, and then writes the chunks to all but one drive in the
array and the parity data to the last drive. When the host requests data from the
disk drives, the controller retrieves the chunks containing the addressed data, re-
constitutes the data from the chunks, and passes the data to the host.
Figure 2–7 Diagram of a RAID 4 Write