Even if failure probabilities are different for hard disks due to the individual specificity such as a hard disk manufacturer, model number or the like, a disk with high failure probability is reliably determined and removed from the operating RAID to be kept in a standby state as a hot spare disk, thereby...http://www.google.com/patents/US20080244309?utm_source=gb-gplus-sharePatent US20080244309 - DISK ARRAY DEVICE, OPERATING METHOD THEREOF AND PROGRAM-STORING MEDIUM
