A protection mechanism for use in a mass storage system for providing user selectable levels of protection against data loss wherein storage segments of a plurality of disk drives are organized into at least two functionally separate logical units and a memory management mechanism is responsive to an...http://www.google.ca/patents/US5893919?utm_source=gb-gplus-sharePatent US5893919 - Apparatus and method for storing data with selectable data protection using mirroring and selectable parity inhibition
