A set of storage disks includes a mirrored pair of disks. Each disk in the pair includes a mirror copy of data stored on the other disk in the pair. For each of the disks in the pair, the data forming the mirror copy is physically located between the center of the disk and the data that is mirrored on...http://www.google.com.tw/patents/US20020087788?utm_source=gb-gplus-share專利 US20020087788 - High performance disk mirroring
