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Abstract

A method for handling data in a plurality of data storage disks having user data sectors and corresponding parity sectors, the method being used when the disks are being operated in a degraded mode wherein data in sectors of an inoperative user data disk are reconstructed from data in the corresponding sectors of the other user data disks and the corresponding parity entry. The reconstructed user data in a user data sector of the inoperative disk is written into the corresponding parity sector in place of the parity entry therein, before any new data is written into the corresponding sector of an operative disk. Information identifying the inoperative disk is written into a specified identification region of the parity disk to indicate that such operation has occurred. The new data is then written into the corresponding sector of the operative disk.

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First Claim