A split parity spare disk achieving method for improving the defect endurance and performance of a RAID subsystem which distributively stores data in a disk array consisting of a plurality of disk drives and carries out an input/output operation in parallel includes the steps of: constructing the disk...http://www.google.ca/patents/US6070249?utm_source=gb-gplus-sharePatent US6070249 - Split parity spare disk achieving method in raid subsystem