When performing mirrored disk restores, including both disk level mirrored restores and file level mirrored restores, rather than first restore data to a mirror disk and later move that data to the primary disk, the data on the primary disk is first copied to the mirror disk, and thereafter, the data...http://www.google.de/patents/US6832330?utm_source=gb-gplus-sharePatent US6832330 - Reversible mirrored restore of an enterprise level primary disk
