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This question already has an answer here:

In a RAID5, the parity block is a XOR calculation of the rest of blocks but, in a RAID6, the second block parity is the XOR calculation of what blocks?


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marked as duplicate by Shane Madden, MadHatter, Ward, mdpc, Tim Brigham Sep 26 '13 at 18:53

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

It's not an XOR, more complex math is needed. It's on the wikipedia page you linked that image from:

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