Systems, methods, and devices for multi-dimensional flash RAID data protection

摘要

A method for recovering corrupted data stored in persistent memory provides protection against, at least, loss of a single block, loss of a single page, as well as a high number of random retention errors. In some implementations, each data element in a quadrant of the persistent memory is protected by a row check word and a diagonal check word. Each row check word includes a value resulting from a mathematical operation performed on a respective row set comprising a set of data elements and each diagonal check word in the quadrant includes a value resulting from a mathematical operation performed on a respective diagonal set comprising a set of data elements distributed over the banks, blocks and pages in the quadrant so that failure of any one page, block or die in the quadrant does not result in the loss of any data in the quadrant.