In the past, storage unit (disk drive) failures were the primary cause of data loss in a storage system. With higher unit reliability and higher bit density, random bit errors have become the primary cause of data loss. Most data recovery mechanisms treat reconstruction of redundant information on the...http://www.google.fr/patents/US7428691?utm_source=gb-gplus-shareBrevet US7428691 - Data recovery from multiple failed data blocks and storage units
Data recovery from multiple failed data blocks and storage units