A redundant disk storage system having data stored on one disk and identical data on second disk, wherein the data stored on the second disk is in a different radial location determined by an offset. The offset could be such that the data on the first disk is stored near the inner circumference and the...http://www.google.co.uk/patents/US5887128?utm_source=gb-gplus-sharePatent US5887128 - Method and apparatus for redundant disk storage system with offset
