Data verification redundant method and device

The present invention discloses a method for redundancy check of data, which comprises a method for updating verification data. The method comprises: acquiring updated data; reading the current data of a position to store the updated data; computing the exclusive OR value of the current data and the updated data; reading the current verification data of the verification data storing position; computing the exclusive OR value of the current data and the updated data and the exclusive OR value of the current verification data as new verification data; and writing the new verification data in the verification data storing position. The present invention also discloses a device for redundancy check of data. The method and the device for redundancy check of data can quickly update the verification data and improve the integrated performance of a network storing system.