A disk control mechanism for controlling the operations of a movable arm disk drive. The disk control mechanism contains a disk access scheduler which accepts disk access requests having a deadline and a disk location. The disk access scheduler further consists of a queue data structure for storing...http://www.google.com.tw/patents/US5787482?utm_source=gb-gplus-share專利 US5787482 - Deadline driven disk scheduler method and apparatus with thresholded most urgent request queue scan window 
