A first content portion of a first disk partition is mirrored to a second content portion of a second disk partition. A first one of the first content portion and the second content portion that is modified contemporaneously with access by one or more client applications to one or more subportions of...http://www.google.com/patents/US6941430?utm_source=gb-gplus-sharePatent US6941430 - Mirrored disk partition with disk partition modification contemporaneous with client application access
