A data storage apparatus has a plurality of n disks and data comprising a plurality of data groupings stored respectively across the plurality of n disks. Each one of the n data groupings comprises a data portion and a data redundancy portion. Advantageously, the n data portions are recoverable from...http://www.google.com/patents/US6557123?utm_source=gb-gplus-sharePatent US6557123 - Data redundancy methods and apparatus
