Parity blocks are only read when there is an error in any sector with data and it should be restored, also if more than one disk fails at the same time we will lose all of the data since it will be impossible to restore its contents by the lack of parity blocks.
Usawa vitalu ni soma tu wakati kuna kosa katika sekta yoyote na data na inapaswa kurejeshwa, pia kama mmoja zaidi ya diski itashindikana wakati huo huo sisi kupoteza data zote tangu itakuwa vigumu kurejesha yaliyomo kwa ukosefu wa usawa vitalu.